Features: Made of high quality zinc alloy, durable and stable performance Invisible remote control lock, specially designed for home security No keyholes outside, there is no way for thieves Tiger lock method, more safe and stable Touch design, it can be locked and unlocked by touching the lock body when indoors Support 3 unlock mode: Remote Control Unlock & Indoor Touching Unlock Super design and easy for installation Specification: Condition: Brand New Material: Zinc alloy Color: Golden, Silver Optional Type: A, B, C, D Type A: Golden, no USB Bluetooth Adapter Type B: Silver, no USB Bluetooth Adapter Type C: Golden, with USB Bluetooth Adapter Type D: Silver, with USB Bluetooth Adapter Power 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 * 2.2in Package Weight: Approx. 1050g/37oz Note: 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. .