Wireless Doorbell Kit No Battery Needed, 1 Battery Free Push Button & 2 Plug-in Doorbells, Plug&Play, Ranges up to 300ft Through Built-in Extender, 25 Tunes, LED for Hearing Impaired, Waterproof NO MORE CHANGING BATTERIES NEEDED or WORRY BATTERY HAS RUN OUT! By pressing the push button, it converts kinetic energy into an electrical signal to ring your wireless doorbells. So no more worrying your push button runs out of batteries and no more hassling in buying awkward weird batteries to run your push button. You will always be able to hear your doorbells ring! PUSH BUTTON WILL WORK IN ANY WEATHER! Push button can withstand temperature ranging from 0F to 120F, it is water proof and tested to withstand 200,000 pushes! Made with top quality materials, this doorbell kit is CE & Rohs certified and comes with a ONE YEAR WARRANTY! PLUG AND PLAY! KIT COMES PAIRED ALREADY and FREE 3M DOUBLE-SIDED TAPE ON PUSH BUTTON FOR EASY INSTALLATION! Just plug in the wireless doorbells into a power socket and simply stick (or screw) the battery free push button next to your door. Works immediately! HEAR IT ANYWHERE IN YOUR HOME! Wireless doorbell kit comes with two plug-in door bells. You can place the two doorbells around 100-150 feet away from the push button and have both of them ring. Or put one doorbell 100-150 feet away from push button and then the second door bell placed a further 100-150 feet away. This will extend doorbell connectivity range up to 300 feet! SUITABLE FOR HEARING IMPAIRED and UP TO 25 MELODIES to choose from including traditional door chime sounds to different songs! Doorbell can be rung at 3 adjustable volumes with loudest at 110 decibels (dB). It can also be in mute and be notified by the beautiful LED strobe when someone presses the doorbell!