Housmile Wireless Doorbell,Waterproof Chime Kit Operating at 1000ft with 1 Push Button TransmitterBattery includedand 2 plug-in Receivers,52 Chimes Adjustable function4 level adjustable sound volume(25-110 dB) Option for your own  52 stereophonic melodiousmusic for your choice. Lightning Display  Blue LED flashes when doorbell is working. Wireless Transmitting Range  Be suitable for 500ft-1000ft wireless transmitting distance. Energy Saving & Environmental Protection  It costs Less power, applying to power-saving mode.