wireless doorbell self powered,wireless doorbell waterproof,2 plug-in receivers and 1 push button with 38 chimes, 4 volume levels,no battery required,white male cousin <b>male cousin self power generating wire free electric doorbell,self-generating battery-free wireless doorbell</b><br><br> battery-free wireless doorbell, driving wirelesssignal by pressing power generaton, no battery,no wiring,simple installation, green and environmental protection, the appearance is minimalist design, and the shape is round and beautiful.<br> can be used with receiving devices such as wireless receivers/smart switches for remote control of electrical equipment, which can easily realize single control, dual control, multiple control and mutual control.<br> <b>38 tunes to choose </b><br> the battery-free wireless doorbell offers 38 different ringtones with 3 levels of adjustable sound volume on your choice.<br> <b>easy installation</b><br> transmitter self-powered doorbell, without any battery, just plug the receiver into an electrical outlet,the push button transmitter can be fixed to the door with the provided adhesive tapes or screws.(tip:please avoid installing on metal objects(iron gates,iron windows,etc.)to avoid affecting the launch distance.please try it before fixed transmitter.)<br> <b>multi use</b><br> it is fit for home, apartment, office, villas and more. seniors and disabled use doorbells as assisted living call pagers! ensures that you will not miss any visitors, you can hear the sound even from back garden.<br> <b>included: </b><br> 1 × transmitter (no battery required),1× plug-in receiver,1 × adhesive tape,2 x screws,1 × user manuel<br><br> <b>easy setting</b><br> *pairing*<br> press the pairing button on the right of the receiver for 3 seconds within 1 minute after power-on;<br> when the blue light on the receiver is always on, the receiver has entered the pairing mode;<br> press the transmitter, the blue light flashes on the receiver, and the pairing is successful.<br> <b>notice: have been paired well before shipment, so you can directly plug and use it while you get the goods, no need to pair again.</b>