Feature Power-off memory: continuous network when power-offEasy installation: sticker installationBack-up battery power supply: long battery life5 music settings: to meet the volume needs of different occasions58 ringtones can be freely selected: can be set for different room Powerful Penetration High frequency emiion technoloy , stronger penetrationMulti-floor signal cover age af lar ge house Different volume is suitable for different scene The product is divided into 5 levels and the volume can be adjusted (including mute)Meet the needs of different environments and different volume levelsThe doorbell host can adjust a total of 58 music Easy to install Tear off the tape on the back of the doorbell button and paste it on a clean wall, and plug the doorbell host into the socket to use Tuya APP Tuya App can be used to buy WiFi style doorbellWhen the doorbell rings, you can receive App reminders on your mobile phone (Doorbells that do not connect to WiFi do not have this function) Custom combination According to your demand customize your doorbellYou can choose the doorbell combination according to your need Doorbell button battery has long battery life Low power consumption design, long time use. Specification 1 Power supply: 110/220VAC2 Backup battery: 3.7V/500mAh lithium battery3 Working current: <100mA4 Wirele frequency: 433MHz5 Working temperature: -10~55