2.4GHz Wireless Anti-theft Device with Audible and Visual Alarm, Anti-hijacking Engine Lock, Compatible with 24V Cars, Trucks, Buses, and RVs. Product Type: Car Anti-theft Device. Material: ABS. Alarm Method: Audible and Visual Alarm. Alarm Response Time: 0.1 seconds. Compatible Models: 24V Cars, Trucks, Buses, RVs, and Vans. Comes with 2 Matching Batteries: Battery Type: Button Battery. Battery Model: CR-2032. Battery Capacity: 210mAh. Functions: 1. Compatible with any 24V car installation. 2. Strong compatibility (can be installed on vehicles with existing anti-theft alarms). 3. Uses 2.4GHz FSK/GFSK bidirectional transmission signal technology. 4. Sensing detection range approximately 2-8 meters / 6.6-26.2 feet. 5. Sensing distance is freely adjustable. Anti-theft Functions: 8. If the system installed in the vehicle does not detect the card, the vehicle will not start if the door is forcibly opened. This is the anti-theft function. 9. Anti-robbery Function: If the card is removed and the vehicle leaves while it is in motion, the vehicle will automatically shut off after 1 minute. This is the anti-robbery function. 9. Emergency Release Mode (User-friendly system function selection: Car Wash Mode, Maintenance Mode) 11. Compact size, easy wiring and installation, highly concealed. 12. The product uses a 2.4GHz frequency, with low interference and energy saving. 15. Maximum load current: 20A. You can choose to disconnect the ON1 line control. This connection method can achieve anti-theft and anti-robbery functions (when the vehicle is not started, if the sensor card is not inside the vehicle, the vehicle cannot start, achieving the purpose of anti-theft; after the vehicle is started, if the sensor card is not inside the vehicle, the vehicle will automatically shut off, achieving the purpose of anti-robbery).