Features: Made of high quality zinc alloy, durable and stable performanceInvisible remote control lock, specially designed for home security No keyholes outside, there is no way for thievesTiger lock method, more safe and stableTouch design, it can be locked and unlocked by touching the lock body when indoorsSupport 3 unlock mode: Remote Control Unlock & Indoor Touching Unlock & Mobile Phone Bluetooth UnlockSuper design and easy for installationSpecification:Condition: Brand NewMaterial: Zinc alloy Color: Golden, SilverOptional Type: A, B, C, DType A: Golden, no USB Bluetooth AdapterType B: Silver, no USB Bluetooth AdapterType C: Golden, with USB Bluetooth AdapterType D: Silver, with USB Bluetooth AdapterPower Supply: 2 * AA batteries (not included) Transmission Frequency: 433MHz(500KHz) Operation Range: Within 20m Unlock Mode: Remote Control Unlock & Indoor Touching Unlock & Mobile Phone Bluetooth Unlock(need to buy USB Bluetooth Adapter Type)Package Size: 23 * 19 * 5.5cm/9.1 * 7.5 * 2.2inPackage Weight: Approx. 1050g/37ozNote:1. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard..