Portable Design & Versatile UseThe wireless doorbell does not necessitate WiFi or power sockets. The receiver and transmitter can be positioned at your convenience and utilized as a pager. The receiver may be situated on a tabletop or kept in your bag as you prefer. Whether you're in the cellar, the garage, or the garden, you'll always be aware of your visitors. Easy to InstallThe doorbell transmitter requires no battery power, just press to recharge. The easily installed transmitter will be set up in only several minutes.And there are 2 ways to place your receiver-by sticker & screws. 4 Volume 38 Ringtones For Your ChoiceThere are 38 ringtones and 4 adjustable volume levels(included silent mode) to choose from. The 38 kinds of ringtones can be chosen as per you like. With adjustable volume from >=50 db, it will suitable for most of your room. Weather Resistant and Energy-SavingThe doorbell is composed of premium ABS, which offers high performance in terms of fire and flame resistance. Doorbell transmitter can operate in temperature range of -20 F to +60 F, Doorbell receiver can operate in temperature range of -10 F to +40 F and provide IP44 waterproof and dust-proof protection. The receiver adopts an optimized circuit design while the transmitter does not use power until pressed. The battery life is for about 3 years. Ultra-long Range The signal from the wireless bell ranges up to 1000ft/300m. ensures you to hear and answer the doorbell in time. Either you are occupied a few rooms away or on another floor, never worry about missing visitors. Wireless Doorbells for Home/Classroom/Office.