1. Introduction
The X-Sense Smart Mailbox Alarm System (Model SMA11) provides real-time notifications when your mailbox is accessed. This system includes a wireless mailbox sensor (SMA11) and an SBS50 Base Station, designed to keep you informed about mail delivery. The system operates on a 2.4 GHz Wi-Fi network and is built for reliable performance in various weather conditions.
The SMA11 sensor is IP65 weatherproof, ensuring durability against rain, snow, and sunlight. It is compatible with a wide range of mailbox types, offering flexible installation options.
2. Package Contents
Verify that all items are present in your package:
- 1 x X-Sense Smart Mailbox Alarm (SMA11)
- 1 x X-Sense SBS50 Base Station
- 1 x User Manual (this document)
- Mounting accessories (double-sided tape)
- 1 x CR2 Battery (pre-installed or included separately)

Image: Overview of the X-Sense Smart Mailbox Alarm system, showing the base station, mailbox sensor, and the mobile application interface.
3. Product Overview
The system consists of two main components:
- SMA11 Mailbox Sensor: This compact, wireless sensor is installed inside your mailbox. It detects when the mailbox is opened and sends a signal to the base station.
- SBS50 Base Station: This central unit connects to your home's 2.4 GHz Wi-Fi network. It receives signals from the mailbox sensor and relays notifications to your smartphone via the X-Sense Home Security App. The base station also features an adjustable alarm and customizable ringtones.
4. Setup
4.1 App Installation
- Download the "X-Sense Home Security" app from the Apple App Store or Google Play Store.
- Register for an account or log in if you already have one.
4.2 SBS50 Base Station Setup
- Plug in the SBS50 Base Station to a power outlet near your Wi-Fi router.
- Open the X-Sense Home Security App and follow the in-app instructions to add the base station to your account. Ensure your Wi-Fi network is 2.4 GHz, as 5.0 GHz networks are not supported.
- Once connected, the base station's indicator light will confirm its status.

Image: The SBS50 Base Station can connect up to 50 X-Sense devices, forming a comprehensive home security system.
4.3 SMA11 Mailbox Sensor Installation
The SMA11 sensor is designed for wire-free installation using the included double-sided tape. It is compatible with various mailbox types, including curbside/post mount, wall mount, slot type, and cluster type mailboxes. It is not suitable for mail slots without lids.
- Prepare the Surface: Clean the interior surface of your mailbox where the sensor will be mounted. Ensure it is dry and free of dust or debris.
- Attach Tape: Apply the double-sided tape to the back of the SMA11 sensor.
- Mount Sensor: Position the sensor inside the mailbox. For optimal detection, mount it on the inside of the mailbox door or a surface that moves when the mailbox is opened. Ensure the sensor's detection area is clear.
- Add to App: Follow the in-app instructions to add the SMA11 sensor to your X-Sense Home Security App. This typically involves scanning a QR code or following a pairing process.
- Test Functionality: Open and close your mailbox to test if the sensor triggers an alert in the app.

Image: Simple three-step installation process for the SMA11 Mailbox Sensor using adhesive tape.

Image: The SMA11 Mailbox Sensor is compatible with multiple mailbox designs, excluding lidless mail slots.
5. Operating Instructions
5.1 Real-Time Notifications
When your mailbox is opened, the SMA11 sensor will detect the activity and send an immediate alert to your X-Sense Home Security App. You will receive a push notification on your smartphone.

Image: Example of a real-time push notification received on a smartphone when the mailbox is opened.
5.2 App Features
The X-Sense Home Security App allows you to manage various aspects of your mailbox alarm system:
- Device Sharing: Share access to the mailbox alarm with up to 12 family members, allowing multiple users to receive alerts.
- Mail Reminder: Set up reminders within the app to check your mail.
- One-Button Silence: Quickly silence the base station alarm from the app.
- Volume Adjustment: Adjust the base station's alarm volume up to 100 dB.
- Ringtone Selection: Choose from various ringtones for your base station alerts.
- Custom Device Names: Personalize device names for easier identification and management within the app.

Image: The SBS50 Base Station offers adjustable volume and multiple ringtone options for audible alerts.
6. Maintenance
6.1 Battery Replacement
The SMA11 Mailbox Sensor uses a replaceable CR2 battery. The battery is designed to last approximately 4 years based on 5 daily triggers. The X-Sense Home Security App will provide a low battery warning when replacement is needed.
- Access the battery compartment on the SMA11 sensor.
- Remove the old CR2 battery.
- Insert a new CR2 battery, ensuring correct polarity.
- Close the battery compartment securely.

Image: The SMA11 sensor features a replaceable CR2 battery with an estimated 4-year lifespan.
6.2 Cleaning
Wipe the exterior of the SMA11 sensor and SBS50 Base Station with a soft, dry cloth as needed. Avoid using harsh chemicals or abrasive cleaners.
7. Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| No notifications received. |
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| Base station not connecting to Wi-Fi. |
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| False alarms from sensor. |
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8. Specifications
| Feature | Detail |
|---|---|
| Model Number | SMA11 (Sensor), SBS50 (Base Station) |
| Brand | X-Sense |
| Connectivity | 2.4 GHz Wi-Fi (Base Station), Wireless (Sensor to Base Station) |
| Sensor Battery Type | 1 x CR2 Lithium Battery |
| Sensor Battery Life | Approx. 4 years (based on 5 daily triggers) |
| Sensor Voltage | 3 Volts |
| Sensor Dimensions (L x W x H) | 3.91 x 1.06 x 1.02 inches |
| Sensor Weight | 7.6 ounces |
| Control Method | X-Sense Home Security App |
| Maximum Wireless Range | Up to 50 meters (sensor to base station) |
| Sensor Technology | Infrared Sensor |
| Weather Resistance | IP65 Waterproof (SMA11 Sensor) |
| Operating Temperature | 14–140°F (-10–60°C) |
| Installation Method | Pre-paste (double-sided tape) |
| Included Components | Smart Mailbox Alarm, SBS50 Base Station, User Manual |
9. Warranty and Support
For warranty information, technical support, or further assistance, please refer to the official X-Sense website or contact X-Sense customer service directly. Details can typically be found on the product packaging or within the X-Sense Home Security App.
You can also visit the X-Sense Store on Amazon for additional product information and support resources.




