『No Battery Required』AURTEC Wireless Doorbell,Waterproof Door Chime Kit with 1 Press Self Powered Transmitter & 2 Plug in Receivers,51 Chimes,4 Volume Levels,No Required,Black

【BATTERY FREE】: Transmitter is converting the energy from finger press, the receivers are easy to get rid of the worry about changing batteries, more conveniently and more environment friendly. 【EASY TO INSTALL&USE】: Easily plug receivers into an electrical outlet. The push button can be fixed to the doorframe with the attached adhesive tapes. 【STRONG SIGNAL】: 150m/500ft Wireless Range. It's ideal for large spaces which with several entranceways or multiple floors big house, office, hotel service and other areas. Never miss a visit or delivery. 【HIGH QUALITY AND DURABLE TRANSMITTER】: IP44 waterproof, none combustible ABS850 materials, 20 years operation life, -4℉~149℉ working temperature. 【MULTIFUNCTIONAL RECEIVERS&SERVICE】: 51 chimes, 4 volume levels, power plug, invisible LED indicator.2-Year friendly customer service. Please feel free to contact us anytime.