•Self-generating transmitter, no battery is needed, a finger press can trigger the generator to convert into electrical energy •Barrier-free receiving distance can reach 150M in a straight line •4 levels adjustable volume, which can be adjusted freely (Volume can be adjusted to mute) •The transmitter is installed outside the door, the receiver is installed on the power socket, press the transmitter and ring the bell, and the receiver immediately rings and flashes to remind Specification: •Model: FA99 •Music: 36 music optional •Volume: 4 levels of volume adjustable (adjustable mute) •Transmitter: no battery required, press to generate electricity •Receiver: plug in the power supply (110-220V) •Transmitter size: 70*46*24mm •Receiver size: 91*59*25mm •Remote control distance: straight line 150M on open ground Package included: •1 x EU Plug Receiver •1 x Transmitter •1 x English User Manual •1 x Installation Tool Kit