Smart Wireless Doorbell Ding Dong Ring Ringtone Alarm for Home Security Entry

Feature: 1. Built in 8 chords and 58 music rings, you can adjust your favorite ringtone. 2. 5 level adjustable volume (including mute) to meet the needs of different environments and different volume levels. 3. With power off memory function, all settings could be saved after power off. 4. Built in back button battery, standby time up to 5 years. 5. Low battery alarm reminds you to charge the doorbell in time, and with tamper alarm, when someone breaks the doorbell, the host will emit an alarm. 6. Stronger signal, stronger wall penetration capability, wider coverage, longer transmission distance, up to 300 meters 984.3ft. Specification: Condition: 100percent Brand New Item Type: Wireless Doorbell Material: ABS Color: As picture shown Back Battery: 3.7V 300mAh Lipo Battery (Built in) Working Current: <100mA Wireless Frequency: 433MHz Volume: 85dB Working Temperature: 10 55 celsius . Package List: 1 x Indoor Unit1 x Outdoor Unit1 x Tape1 x Manual