Smart Wireless Doorbell Kit With Solar Powered Button And Plug-In Chime For Household,4-Level Volume Features: Unique and elegant style Power saving and durability with solar power transmitter Receiver plug, European / American / British model optional Range in open space: max. 200-300m 2 tunes of different styles,4-level Adjust volume, including mute mode Free pairing: transmitter can be matched with several receivers. receiver can also be matched with several transmitters Package size: 4.09x3.78x3.03 inch,Gross weight:0.4 lb Doorbell parameters: Solar cell: 150mah polymer lithium battery Maximum power of emitter solar panel: 5.5V 25mA 0.13w Working current: 12mA reminder: press the button for 0.5 seconds Working range: about 200-300m (open area) grade of transmitter: IP65 Dingdong machine parameters: Working voltage: 90-260v Standby current: 10mA Working current: 60 Working frequency: 433MHz Power: ≤ 2W Music: 52 Adjust volume: 20-80db (4-gear cycle adjustment) The Package Include: 1 x Doorbell 1 x Ding dong machine 1 x Use manual 1 x Installation tool It is a very practical household tool with a sense of life ritual. Installed outside the door, the appropriate volume alerts the doorbell to be able to serve as a reminder when someone is visiting. Make the connection between inside and outside of the house, convenient for your life, easy for you to understand the situation outside the door. Exquisite and compact design avoids damaging the wall decoration effect, and at the same time, it will not be overlooked. Quality materials and performance allow it to be used for a long time.