1. Introduction
The KERUI W202 is a high-end GSM/WiFi alarm system featuring a 2.4-inch TFT color screen, touch keyboard, and a powerful built-in CPU master for stable and reliable performance. This system can be wirelessly connected with various accessories such as PIR motion sensors, door sensors, smoke detectors, gas detectors, remote controls, and emergency buttons.
Upon receiving an alarm notification, the panel's LED display will show the alarm zone and trigger an immediate alarm. Simultaneously, the system will push alarm messages via the APP and call preset user numbers. The W202 is designed for wide use in homes, factories, schools, stores, financial offices, villas, and communities to ensure personal and property security.
2. Features
- TFT color display with humanized menu and voice prompts for ease of use.
- Supports 2.4G WiFi for simple network access configuration.
- Real-time alarm panel status updates to the APP.
- Supports multiple panels operated simultaneously with no quantity limit.
- RFID card disarming, supporting up to 20 cards.
- Alarm push notifications via mobile APP (iOS and Android operating systems).
- GPRS data transfer to network monitoring center; remote arm/disarm via monitoring center.
- Supports 99 zones with 8 optional zone attributes per zone, and ON/OFF siren control.
- Functions as a common cellphone for direct calling.
- Remote system settings via calling or SMS.
- 8 groups of timed Arm/Disarm functions, with weekly timing options for automatic control.
- One-way alarm linkage wireless relay and one-way wireless strobe siren.
- Supports 20 smart outlets controlled via phone or SMS for remote appliance control.
- Panel calls preset phone numbers during alarms; numbers are retained even if power is off.
- 10-second auto message recording for self-service voice prompts, allowing users to remotely identify alarm locations and zones.
- Remote control for Arm/Disarm, voice monitor, intercom, siren ON/OFF, and smart outlet ON/OFF.
- Supports up to 99 detectors and 99 remote controls from the 1527 accessory series.
- Integrated high-precision clock chip ensures accurate timekeeping even without power.
- Black box function records 99 arm/disarm/alarm events and 99 RFID card readings.
- Low-battery reminder and anti-tamper function.
- Built-in rechargeable high-capacity lithium battery for backup power.
- Incoming call and power-off reminder functions.
3. Specifications
| Attribute | Value |
|---|---|
| Model Number | W202 |
| Brand Name | KERUI |
| Kit Configuration | Door/Window Sensor |
| Communication Interface | Wireless |
| Arming Type | APP |
| Video Interface | No |
| Display | Yes |
| Password Keyboard | Yes |
| Zone Number | 99 |
| Output Number | 5 |
| Smart home platform | Tuya |
| Alarm Type | The Alarm, SMS, Apps Control |
| Power (W) | DC5V |
| Input Voltage | DC5V |
| Standby Current | <50mA |
| Alarm Current | <450mA |
| Wireless Frequency | 433MHz |
| Communication Standards | Support GSM850/900/1800/1900MHz |
| Back-up Battery | 3.7V High Capacity Lithium Battery |
| Alarm Volume | 80dB (built-in siren) |
| Accessories Code | EV1527 detectors |
| Oscillation resistance recommended | 150K-470K |
4. Setup and Installation
4.1 Panel Installation
The alarm panel should be installed in a central position within the guarded area to ensure optimal reception of signals from all detectors. Avoid installing it near large metal objects or appliances that generate high-frequency interference. Also, avoid reinforced concrete walls and fire doors as these can act as barriers.

Figure 4.1: Alarm Panel Keypad and Screen

Figure 4.2: Alarm Panel Ports
4.2 Door Sensor Installation (D025 / MC11)
Door sensors detect the open/closed state of doors, windows, or other objects. They consist of a transmitter and a magnetic bar. When the magnetic bar separates from the transmitter, an alarm signal is sent to the panel.
- Install part A (transmitter) on the fixed door frame and part B (magnet) on the movable door.
- Ensure parts A and B are in the same vertical line, with a distance of no more than 1 cm.
- After installation, the indicator light should flash for 1 second when the door opens, confirming successful installation.
- A constant light indicates low power.
- Sensors can also be installed using screws.

Figure 4.3: D025 Door Window Sensor

Figure 4.4: MC11 Door Window Sensor
4.3 Motion Sensor Installation (P817 / P831 / P861)
Ensure the motion sensor's power switch is ON before use. Install at approximately 2.2 meters above the ground, ideally in a room corner, to achieve the best detection range. Position it to form a certain angle with the indoor walking line (a 90-degree angle to the walking direction is optimal).
Installation Steps:
- Remove the mounting bracket provided.
- Press the bracket into the slot at the bottom of the detector.
- Find the base and secure it to the wall with two screws.
- Press the PIR sensor with its bracket into the center hole of the base.
- Adjust to the optimal detection angle.
Important Considerations:
- Do not face the motion sensor directly towards windows.
- Ensure no large objects obstruct the detection coverage area.
- Avoid installing two motion sensors in the same space to prevent interference.
- Do not face windows, cooling/warming machines, stoves, or other appliances that cause rapid temperature changes, as this can trigger false alarms.
- Motion sensors are for indoor use only and should not be used outdoors.

Figure 4.5: P817 Curtain PIR Motion Detector

Figure 4.6: P831 PIR Motion Detector

Figure 4.7: Anti-pet PIR Motion Detector

Figure 4.8: P861 Waterproof PIR Outdoor Motion Detector
4.4 Adding Accessories (Remote Controls, Sensors, RFID Cards)
The system supports adding up to 99 remote controls, 99 detectors, and 20 RFID cards.
4.4.1 Adding Remote Controls (RC531 / RC532)
- On the alarm panel, press the 'Menu' key, navigate to 'Accessories Management', and select 'Remote'. Alternatively, press '2' on the keypad to enter directly.
- Select the desired zone (01-99) using 'Up/Down' or by entering the number. Press '√'.
- Press any key on the remote control to transmit a signal. The panel will beep once, confirming successful programming.
- To add multiple remote controls, repeat the process.

Figure 4.9: KERUI RC532 Remote Controller

Figure 4.10: KERUI RC531 Remote Controller
4.4.2 Adding Sensors (PIR, Door/Window, Smoke, Gas, Water Leakage)
- On the alarm panel, press the 'Menu' key, navigate to 'Accessories Management', and select 'Sensor'. Alternatively, press '2' on the keypad to enter directly.
- Select the desired zone (01-99) using 'Up/Down' or by entering the number. Press '√'.
- Trigger the sensor (e.g., open a door for a door sensor, move in front of a PIR sensor). The panel will beep once, confirming successful programming.
- To add multiple sensors, repeat the process.

Figure 4.11: S20 Smoke Detector

Figure 4.12: GD13 Gas Detector

Figure 4.13: KERUI Tuya Smart WIFI Water Leakage Detector
4.4.3 Adding RFID Cards
- On the alarm panel, press the 'Menu' key, navigate to 'Accessories Management', and select 'RFID'. Alternatively, press '3' on the keypad to enter directly.
- Swipe the RFID card. The panel will beep once, confirming successful programming.
- Each RFID card can be assigned to a specific defense zone.

Figure 4.14: KERUI RFID Card
5. Operation
5.1 Power On
Connect the main power line to the 'Line' port. Insert a valid SIM card into the SIM slot. Connect the power adapter. You will hear an alert: "Welcome to use alarm system".
5.2 Arming the System
Arming activates all on-site alarm detection. All connected detectors will be in a working state. If any detector (theft, fire, gas leak, etc.) is triggered, the panel will alarm immediately.
- Remote Control: Press the 'Arm' key once.
- Keyboard: Press the 'Arm' key once.
- APP/SMS: Use the smartphone app or send an SMS command to arm the system.

Figure 5.1: Arming Options
5.3 Disarming the System
Disarming stops any active alarm and places the system in a non-alert state. When disarmed, detectors will not trigger an alarm, except for those in emergency zones or the emergency button on the remote control.
- Remote Control: Press the 'Disarm' key once.
- Keyboard: Press the 'Disarm' key once.
- RFID Card: Swipe a programmed RFID card.
- APP/SMS: Use the smartphone app or send an SMS command to disarm the system.

Figure 5.2: Disarming with RFID Card
5.4 Home Arm
Home Arm is used when someone is at home. Perimeter detectors (doors, windows, balconies) remain active, but indoor detectors are inactive to prevent false alarms triggered by the user. Ensure interior detectors are configured as 'Home Arm' zones for this function to work correctly.
- Remote Control: Press the 'Home Arm' key once.
- Keyboard: Press the 'Home Arm' key once.
5.5 Emergency Alarm (SOS Function)
In an emergency, press the panic key on the remote control or press the '√' button on the panel for 3 seconds to activate the emergency alarm state. If keyboard password protection is enabled, the password (default: 123456) must be entered before operation.
5.6 Phone Call Function
The alarm panel can function as a common phone. On the main page, navigate to 'Phone' (or press '6' on the keypad). Enter the desired phone number and press the call button. Use the 'Back' button to hang up.

Figure 5.3: Alarm Panel Phone Call
5.7 Scheduled Arm/Disarm
The system supports 8 groups of timed arm/disarm functions. This allows for automatic control, avoiding frequent manual arming and disarming.
- From the 'System' settings, select 'Auto Arm/Disarm'.
- Choose a group and set the desired arm/disarm times and days of the week.
- Save the settings.

Figure 5.4: Scheduled Arm/Disarm Function
5.8 Doorbell Function
The alarm panel can function as a doorbell. If a sensor is configured to zone 91, it will act as a doorbell when triggered.

Figure 5.5: Doorbell Function
5.9 SMS Commands
The panel can be controlled via SMS commands. The SMS content must follow the format: Admin Password + Command No. + Item 1 + Item 2 + Item 3 + Item 4 + Item 5. The default Admin Password is 123456.
| NO. | Command | Command No. | Item 1 | Item 2 | Item 3 | Item 4 | Item 5 | Example |
|---|---|---|---|---|---|---|---|---|
| 1 | Disarm | 0 | 1234560 | |||||
| 2 | Arm | 1 | 1234561 | |||||
| 3 | Home Arm | 2 | 1234562 | |||||
| 4 | Call the Panel | 3 | 1234563 | |||||
| 5 | Wireless Outlet On | 4 | 1234564 | |||||
| 6 | Wireless Outlet Off | 5 | 1234565 | |||||
| 7 | Panel Status | 6 | 1234566 | |||||
| 8 | Add Phone | 10 | 01~08 | 1~3 | 12345610011389 |
6. APP Remote Control
The KERUI W202 alarm system can be controlled remotely via the Tuya Smart app. This allows for convenient arming, disarming, and monitoring from anywhere.
6.1 App Download and Registration
Scan the QR code below or search for "Tuya Smart" in your device's app store (App Store for iOS, Google Play for Android) to download the application.

Figure 6.1: Tuya Smart App QR Code
If this is your first time using the app, you will need to register a new account following the in-app instructions.
6.2 Network Configuration
The alarm panel supports both Bluetooth and Wi-Fi for network configuration.
6.2.1 Bluetooth Connection
- Ensure Bluetooth is enabled on your mobile phone.
- On the alarm panel, press the 'Menu' key, navigate to 'LAN' (or press '7' on the keypad).
- Press '2' to disconnect from any connected Wi-Fi network, then press '1' to enter network access configuration.
- On the Tuya Smart app, go to the home page and tap 'Add Device'. The app will automatically scan for nearby devices.
- Select the W202 device, enter your 2.4 GHz Wi-Fi network password, and follow the prompts to complete the connection.
6.2.2 Smart Connection (EZ Mode)
- Connect your mobile phone to your home 2.4 GHz Wi-Fi network.
- On the alarm panel, ensure it is in a normal working state (not alarming or in low power).
- On the Tuya Smart app, tap 'Add Device', then select 'WIFI Connector' under 'Other' category.
- Enter your Wi-Fi password and tap 'Next'.
- On the alarm panel, press the 'Menu' key, navigate to 'LAN' (or press '7' on the keypad).
- Press '1' to enter network access configuration.
- On the app, confirm the indicator is blinking rapidly and select 'Blink Quickly' to start network configuration.
6.2.3 AP Connection
- Connect your mobile phone to your home 2.4 GHz Wi-Fi network.
- On the alarm panel, ensure it is in a normal working state.
- On the Tuya Smart app, tap 'Add Device', then select 'WIFI Connector' under 'Other' category.
- Enter your Wi-Fi password and tap 'Next'.
- On the alarm panel, press the 'Menu' key, navigate to 'LAN' (or press '7' on the keypad).
- Press '3' to enter AP network access configuration.
- On the app, confirm the indicator is blinking rapidly and select 'Blink Slowly'.
- Connect your phone to the device's Wi-Fi hotspot (e.g., 'SmarLife-XXXX') as prompted.
- Return to the app to complete the AP connection.
6.3 APP Operation
Once connected, you can view and operate the alarm system status from the Tuya Smart app. You can arm/disarm the host, manage accessories, and adjust settings.
Video 6.1: Demonstrating App and Remote Control Functions
6.3.1 Arm/Disarm via App
On the app's main screen, tap 'Arm' to arm the system or 'Disarm' to disarm it. You can also select 'Home' for home arming mode.
6.3.2 Adding Accessories via App
- In the app, navigate to 'Accessories'.
- Tap 'Quick add' and trigger the sensor you wish to add. The panel will beep once, and the app will confirm successful addition.
6.3.3 Checking and Editing Accessories
In the 'Accessories' list, you can view the status of each accessory and edit its name or zone attributes.
6.3.4 App Settings
The app's settings page allows you to configure various host properties, including:
- Scheduled arming/disarming.
- Delayed arming and entry delay times (0-255 seconds).
- Alarm duration (0-20 minutes).
- Alarm volume (0-7 levels).
- Host keyboard key tone switch.
- Host voice volume (0-7 levels).
- Alarm phone numbers.
- Factory reset.
- Host language.
7. Maintenance
7.1 Battery Management
The KERUI W202 alarm panel has a built-in rechargeable high-capacity lithium battery that provides up to 8 hours of backup power in case of a power outage.

Figure 7.1: 24/7 Monitoring with Backup Battery
The system includes a low-battery reminder function for the panel and connected sensors. When the panel's battery is low, it will remind you to charge the console. For sensors, the panel receives low power signals, prompting you to replace the sensor battery.
7.2 Cleaning
Regularly clean the alarm panel and sensors with a soft, dry cloth. Avoid using abrasive cleaners or solvents that could damage the devices.
7.3 Firmware Updates
Check the Tuya Smart app periodically for any available firmware updates for your alarm system to ensure optimal performance and security.
8. Troubleshooting
| Issue | Reason | Method |
|---|---|---|
| No dial for alarm | 1. Not armed 2. No alarm phone number set | 1. Perform arm operation 2. Re-set alarm phone number |
| Panel can't read SIM card or dial/send SMS | 1. No SIM card 2. PIN code set for SIM card 3. Bad GSM signal 4. SIM is broken 5. Alarm/SMS number unset 6. Card balance not enough 7. SMS function is OFF | 1. Insert SIM card 2. Cancel PIN code 3. Change panel location 4. Change SIM card 5. Set alarm/SMS number 6. Charge SIM card 7. Enable SMS function |
| Can't remote operate | Wrong admin password | Correct password, change to new password, or restore to factory default |
| No voice replay when alarm | No voice record | Record it again accordingly |
| Accessory doesn't work | 1. No pairing 2. Low battery power 3. Battery holder broken 4. Unmatched with panel | 1. Re-pair 2. Change battery 3. Clean the battery holder 4. Contact seller for replacement |
| Siren no sound | Siren setting is OFF | Open siren setting accordingly |
| Can't receive accessory's signal | 1. Affected by nearby signal 2. Panel receiver is down 3. Panel low battery | 1. Find affected signal and remove 2. Contact the seller and return 3. Check the power supply |
| Panel no voice prompt | Voice prompt function is OFF | Open voice prompt function |
9. User Tips
- For optimal performance, ensure your Wi-Fi network is 2.4 GHz, as the system does not support 5 GHz Wi-Fi.
- Regularly check the battery status of your sensors and the main panel to avoid interruptions in security coverage.
- Familiarize yourself with the different arming modes (Arm, Home Arm) to best suit your daily routine and security needs.
- Consider using the scheduled arm/disarm function for automated security management.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation provided with your purchase or contact the KERUI Official Store directly. You may also find additional resources and FAQs on the product's official support page.
A user manual in PDF format is available for detailed instructions and can be accessed via the seller's product page or by contacting support.