Keyless BT Lock

Features:
*Cut chain, remove the battery cover, detected vibration, three times wrong code will activate alarm.
*Alarm sound up to 115dB, can effectively frighten the thefts.
*Easy operation, no key needed. Supports BT connection, phone APP control lock and unlock.
*Low battery indicator, which makes you replace the battery promptly.
*IP55 waterproof grade, can use both indoors and outdoors.
*The steel chain can be used as self-defense whip.
Note: Phone APP is compatible with iOS 7.0 Android 6.0 or above.