Easy Installation & DIY Plug-in 2 Receivers and 2 Push Buttons, powered by electrical sockets. Simply fixed the Push buttons to the doorframe/ wall with screws or double-sided adhesive tapes. All the required accessories are included in the package for an effortless installation. One Step To Set Tunes Just Press the & key to set your favorite tune and volume, no more pairing steps to confirm. Each receiver can set a different ring tune. The receivers will auto play the selected tune with blue LED indicator flashing when your visitors press the push button. No need to reset after a power outage, thanks to the auto Memory Function 304M/1000FT Wireless Range PYBBO wireless doorbell with 2 Receivers features up to 304M/1000ft wireless range, 115dB max volume and Blue LED indicator, won't let you miss a visitor even if you are on another floor or in another room. Since the signal of each wireless door bell is separated, it won't interfere with other equipment in your house or those of your neighbors 5-LEVEL VOLUME & 60 Tunes The volume can be adjusted to 5 levels, 0 -115 dB(Including Mute mode suitable for children to sleep without being disturbed, the LED flashing light when the doorbell sound is temporarily unnecessary). There are 60 fun tunes to choose from. You can set different tunes for each receiver. And you will enjoy pleasant melodies while someone rings the cordless doorbell WATER RESISTANT AND DURABLE IP55 Waterproof and dustproof level. The doorbell that is heat and water resistant. It can withstand varying weather conditions. And can last throughout the seasons and wont be damaged by fluctuating temperatures, rain, or snow. You can install it outside the door safely. Operating temperatures for doorbell are 14 F - 140F(-10 C - 60 C). Plug-in receivers eliminate the havesles of change disposable batteries or recharge