?4-Digit Combination Bike Lock with 105dB Vibration Alarm - Keyless Resettable Anti-Theft Security Lock for Cycling Frame/Seatpost with Screws & Nuts

Specifacations: Material: ABS Color: Black Size: Applicable Diameters: 21.2-32.8mm(0.83-1.29in). Battery: 1 x 9V 6F22 battery (not included) Working Current: <100mA Sound: >105db Operating Temperature: -15℃-75℃ Package Included: 1 x bike code lock 4 x screws 2 x nuts Password settings and changes: 1. The default password for the product factory is: "ABCA" 2. The following method changes to your own password: long press A key for about 3 seconds, hear the "drop" of the sound, enter the old password, if the password is correct, will hear the "drop" three prompts correct, it is needed in 5 seconds to start entering four passwords, if the change is successful, will hear the "drop" three voice prompts. If you enter the old password error or modify the password is unsuccessful, then the long sound back secret code to modify the state, then the need for the performance. 3. If take the battery for about 30 seconds, the system will automatically reset to the factory default password: "ABCA". Sensitivity adjustment: Product factory set the sensitivity for the mid-range, long press C key to hear "drop" prompts to set the sensitivity to "high", press and hold the C key again to hear the "drop" two tips set sensitivity for the "middle", press and hold the C key again to hear the "drop" three tips to set the sensitivity to "low", continue to press the C key will cycle the above settings performance. Arming: Hold down the B button for about 3 seconds, hear the "drop" of a prompt to enter the arming state, 5 seconds after the start of alert. Note: 1. The correct installation of this product is waterproof, but not immersed in water. 2. It is recommended to use 9V. In some cold areas of winter.