Features 1、Remote control: work within 50 meters of open area, it is recommended to use within 20 meters. Try to avoid metal shielding when using. 2、 Easy to install: magnet fixed on the back, the alarm can be fixed again with rope or tape, no wires or professional installation tools required. 3、 The 120dB loud alarm helps to effectively stop thieves, helps you easily find vehicles and attracts the attention of nearby people. 4、 Vibration alarm, suitable for bicycle, motorcycle, scooter, hulajnogi, door or window. 5、 Come with remote control and keychain for easy control Material: plastic Host battery: 9v alkaline battery (included) Remote control battery: 12v / 23A battery (included) Alarm sound: 120db Fixing method: back magnetic Induction method: vibration alarm Size: about 100 * 53 * 28mm 10cm = 100mm = 3.94inch Instructions: 1. Remove the battery board, determine the positive and negative polarity of the battery, put in a 9V laminated battery, and move into the battery cover. 2. Turn the switch to “ON” and the host will wait for the code. Press the arm key to stop the sound learning. At this time, the host will send a BB sound when the arm key is pressed. The host indicator flashes and the host immediately enters the alert state. 3. When the alarm is subject to vibration, shock and movement, it will emit an alarm sound of 120 dB, and the alarm time will be about 20 seconds. 4. When the alarm device keeps saying "didi di ...", please replace the battery, please remove the battery for a long time. Package List 1 * Motorcycle alarm 1 * Remote