When you get in or out of a car, if you are dangerous, press the push button on the wristwatch, pendant, or keychain type mobile transmitter, you can ring the car horn and inhibit the suspicious person with sound and alert you to the surroundings. ●The transmitter can be carried in 3 different ways, a watch, a pendant, or a key chain. ● When you find a suspicious person trying to touch the car, you can push the button on the transmitter. The reception unit installed in the car will output an alarm when it receives a radio signal emitted from the transmitter. Use the alarm output of the reception unit to ring the car horn to prevent theft beforehand. Specifications: Item Number: TX-104B Type Watch Type Power Supply Button Type Alkaline Battery (LR44 x 2) Included Battery Life: Approx. 2 years (as transmitted once a day), Frequency Range (Output) 426 MHz Band (less than 10 mW), Radio Transmission Distance: Approx. 328.4 ft (100 m) (See Distance) Bandage Functionality, Battery Notification Function, Continuous Transmission Mode, Simple Waterproof Construction. Ambient Temperature - 10°C to +50°C; Weight: Approx. 0.7 oz (20 g) (transmitter body including batteries); Appearance: Main unit: ABS resin (grey); Price: 25,000 yen