CACAZI FA86 Self-Powered Smart Wireless Doorbell Set with Transmitter + 2 Receiver Doorbell Support 150m Distance - White/US PlugSelf-generating transmitter: No battery is needed. A finger press can trigger the generator to convert into electrical energyNot just a doorbell but also a pager: The elderly,children,and pregnant women have needs,just click to know,sleep at night with peace of mind Easily deal with various places: In villas/apartments/office buildings/hotels/nursing homes and other places5 levels of adjustable volume whatever you want: The doorbell has five levels of volume,which can be adjusted freely. (Volume can be adjusted,light reminder)Anti-interference,no crosstalk: Digital circuit design,multiple sets of use will not cause cross talk,effectively avoiding the troubles caused by mutual interference between neighborsSpecifications:Model: FA86Music: 60 music tracksVolume: 5 levels of volume (adjustable to flashing light only)Transmitter: No batteries required,press to powerReceiver: light on only when the bell ringsTransmitter size: 74 x 40 x 20.3mmReceiver voltage: plug in and use (AC110V/220V)Receiver size: 92 x 62 x 32mmRemote control distance:150M in a straight line on open groundPackage included:2 x Receiver1 x Transmitter1 x English Instruction Manual1 x Installation KitOther items not included