Features: Sound/flash alarm: When the car is locked, if it is shaken, the LED light flashes and the horn sounds. Silent alarm: When the car is locked, if it is shaken, the LED light flashes without horn sound. Remote control: Includes 2 remote controls for remote door lock and unlock functions, enhancing convenience. If the door is not closed properly, a "di-di-di" alert will sound. Central locking automation: After the engine is turned off, doors automatically unlock to assist passengers in exiting; press and hold the key for 15 seconds, then press the brake pedal to automatically lock the doors; if no door is opened within 25 seconds after unlocking, the system automatically relocks. Remote trunk release: Press and hold the unlock button for 3 seconds to automatically open the trunk for easier access to contents. (Requires connection to trunk motor.) Specifications: Material: Plastic Host operating voltage: 12V +/-3V Quiescent current: 10mA LED indicator current: 3mA Operating frequency: 315MHz-433MHz Operating temperature: -40°C to 80°C Package dimensions: 190 x 140 x 83mm / 7.5 x 5.5 x 3.3in Package weight: 700g / 24.7 oz Package contents: 1 x Main control unit 2 x Remote controls 1 x LED connection wire 1 x Engine relay 1 x Shock sensor 1 x Speaker 1 x Wiring harness kit 1 x User manual