1. Introduction
This manual provides detailed instructions for the proper installation, operation, and maintenance of your SMALLFATW Police Siren PA System. This system is designed for emergency and public address applications in vehicles, featuring multiple siren tones, a powerful speaker, and a handheld microphone for clear communication. Please read this manual thoroughly before use to ensure safe and effective operation.

Figure 1.1: Overview of the SMALLFATW Police Siren PA System, including the main control unit, speaker, and handheld microphone.
2. Package Contents
Verify that all items listed below are present in your package:
- Siren Control Unit
- Heavy Duty Speaker
- Handheld Microphone
- Wiring Harness
- Mounting Hardware (screws, nuts, washers, bracket)
- Fuse
- Microphone Holder

Figure 2.1: All components included in the Hand-held Siren Kit package.
3. Safety Information
To ensure safe operation and prevent damage, observe the following precautions:
- Electrical Safety: Always disconnect the vehicle's battery before performing any wiring. Ensure all connections are secure and properly insulated to prevent short circuits.
- Loud Sounds: This system produces extremely loud sounds (up to 130 dB). Prolonged exposure to loud sounds can cause hearing damage. Always wear hearing protection when testing or operating the siren in close proximity.
- Mounting: Mount the control unit and speaker securely to prevent them from becoming dislodged during vehicle movement. Ensure the speaker is mounted in a location that allows sound to project effectively without obstruction.
- Auxiliary Switches: The auxiliary switches are rated for 20A. Do not exceed this current rating when connecting external devices.
- Legal Compliance: Be aware of and comply with all local and national laws regarding the use of emergency sirens and PA systems in vehicles. Unauthorized use may result in penalties.
4. Setup and Installation
Follow these steps for proper installation of your siren system:
- Choose Mounting Locations: Select a secure, dry location for the control unit within reach of the driver. The speaker should be mounted in a forward-facing position, typically behind the grille or bumper, ensuring it is protected from direct water spray and debris.
- Wiring the System: Refer to the wiring diagram below. Connect the main power wires (red for positive, black for negative) directly to the vehicle's battery, ensuring an inline fuse is installed on the positive line. Connect the speaker wires (blue and white) to the designated speaker output terminals on the control unit. The auxiliary wires (yellow, green) can be connected to external lights or accessories.
- Microphone Connection: Plug the handheld microphone into the designated port on the control unit.
- Secure Components: Use the provided mounting hardware to securely fasten the control unit and speaker. Ensure all wires are routed safely away from moving parts and heat sources, and are properly secured with cable ties.

Figure 4.1: Detailed wiring instruction diagram for connecting the siren control unit, speaker, and auxiliary power to the vehicle's battery.
Video 4.1: This video demonstrates the installation process for the heavy-duty siren kit, including wiring and mounting procedures.
5. Operating Instructions
Familiarize yourself with the control unit's functions:

Figure 5.1: Control panel layout and functions of the siren unit.
- Power On/Off and Volume Control: Use the main rotary knob to turn the unit on or off and adjust the siren/PA volume.
- Siren/Horn Switch: Toggle this switch to activate the horn sound or switch to siren mode.
- Sound Selector: Rotate this knob to select from the 8 available siren tones, including Wail-1, Wail-2, Yelp, Tool, Hi-Lo, and QS.
- Microphone (PA System): To use the public address function, press and hold the 'Push-to-Talk' button on the handheld microphone and speak clearly into it. Ensure the unit is powered on and the volume is adjusted appropriately.
- Auxiliary Switches: The control unit features two independent 20A auxiliary switches. These can be used to power and control external devices such as strobe lights or hideaway lights. Simply connect your auxiliary devices to the corresponding wiring harness leads and use the switches on the control panel to activate them.

Figure 5.2: Dual 20A auxiliary switches for controlling connected lights or other accessories.

Figure 5.3: Heavy-duty handheld microphone for the PA system.
Video 5.1: This video demonstrates the various siren tones and auxiliary switch functionality of the Vehicles Siren Kit.
6. Features
The SMALLFATW Police Siren PA System offers a range of features designed for versatility and performance:
- 8 Warning Tones: Equipped with 8 distinct warning tones, the system can meet various operational needs, providing clear and effective auditory alerts.
- High Output Speaker (130 DB): The included speaker delivers a super clear and extremely loud sound, reaching up to 130 DB, comparable to the sound of a jet engine. This ensures maximum audibility in critical situations.
- Modes Switch: Easily switch between a standard horn sound and various siren tones, including Wail-1, Wail-2, Yelp, Tool, Hi-Lo, QS, and radio broadcast for comprehensive signaling.
- Dual 20A Auxiliary Switches: Two integrated 20A auxiliary switches allow for convenient powering and control of additional vehicle accessories, such as strobe lights or hideaway lights, directly from the control unit.

Figure 6.1: The powerful 200 Watt speaker capable of producing sounds up to 130 DB.
Video 6.1: This video highlights the features of the SMALLFATW heavy-duty speaker, emphasizing its sound output and construction.
7. Maintenance
Regular maintenance helps ensure the longevity and optimal performance of your siren system:
- Cleaning: Keep the control unit and speaker free from dust and debris. Use a soft, dry cloth for cleaning. Avoid using harsh chemicals or abrasive cleaners.
- Connections: Periodically inspect all wiring connections for tightness and corrosion. Re-tighten or clean as necessary.
- Speaker Inspection: Check the speaker for any physical damage or obstructions that might affect sound output. Ensure the mounting is secure.
- Fuse Replacement: If the unit loses power, check the inline fuse. Replace it with a fuse of the same rating (typically 20A).
8. Troubleshooting
If you encounter issues with your siren system, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No power to unit | Blown fuse; Loose power connection; Incorrect wiring | Check and replace fuse; Verify all power connections are secure; Review wiring diagram for correct installation. |
| No sound from speaker | Loose speaker connection; Damaged speaker; Volume too low | Check speaker wiring; Inspect speaker for damage; Increase volume on control unit. |
| Microphone not working | Microphone not fully plugged in; Faulty microphone | Ensure microphone is securely connected; Test with another compatible microphone if available. |
| Siren tones not changing | Sound selector knob malfunction; Internal unit issue | Ensure knob is rotated firmly; If issue persists, contact customer support. |
| Auxiliary lights not working | Loose auxiliary wiring; Auxiliary switch off; Device malfunction | Check auxiliary wiring connections; Ensure auxiliary switch is ON; Test the connected device independently. |
9. Specifications
| Attribute | Detail |
|---|---|
| Brand | SMALLFATW |
| Model Number | Hand-held Siren |
| Item Weight | 7.78 pounds |
| Package Dimensions | 10.31 x 7.44 x 4.84 inches |
| Color | Hand-held Siren Kit |
| Material | Hand-held Siren |
| Power Source | Corded-Electric |
| Item Package Quantity | 1 |
| Batteries Required? | No |
| Compatible Devices | Cars, Trucks |
| Remote Control Included? | No |
| Manufacturer | SmallFatW Factory |
| UPC | 791261625988 |
10. Warranty and Support
SMALLFATW is committed to providing high-quality products. For warranty information, technical support, or any inquiries regarding your Police Siren PA System, please contact SMALLFATW customer service through the retailer's platform or the official brand website. Please have your product model number and purchase date available when contacting support.





