•Self-generating transmitter: No battery is needed,A finger press can trigger the generator to convert into electrical energy •Long-distance transmission has strong penetration: Strong signal penetration can be used in offices,offices,homes,shops,factories,and other occasions •5 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 neighbors •The receiver can distinguish signals from different transmitters: Through different transmitter signals,let the receiver emit different bells to easily distinguish which door has visitors Specifications: •Model: FA28 •Music: 60 music tracks •Volume: 5 levels of volume (adjustable to flashing light only) •Transmitter: Press to generate power,no batteries required •Receiver: light only when the bell rings •Transmitter size: 74 x 40 x 20.3mm •Receiver voltage: plug-in power use (110-220V) •Receiver size: 90 x 56 x 20mm •Remote control distance:150m in a straight line on open ground Package included: •1 x Receiver •2 x Transmitter •1 x English Instruction Manual •1 x Installation Kit •Other items not included