Fabric Type .Closure Type Snap Button .Neckline Style Scarf Collar .Country of Origin China .Unique and Elegant Style Power-saving and Durable, Comes with Solar Transmitter Receiver Plug, Europe/US/UK Models Optional Open Range .Space: Max. 200-300M2 Tunes of Different Styles, 4 Levels to Adjust Volume, Including Silent Mode Pairing: Transmitter can match with multiple receivers. Receiver can also match with multiple transmitters Packing Size: 4.09X3.78X3.03 Inch, Gross Weight: 0.4 lbs Doorbell Parameters: Solar Cell: 150Mah Polymer Lithium Battery. Maximum Power of Battery Transmitter Solar Panel: 5.5V 25Ma 0.13W Working Current: 12Ma Reminder: Press the Button for 0.5 Seconds Working Range: Approx. 200-300M. (Open area) Transmitter level: 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-speed cycle adjustment) Package includes: 1 doorbell 1 Dingdong machine 1 user manual 1 installation tool