Battery Operated Doorbellbattery wireless door bell is powered by 3 AAA batteries (included) so no electric outlet needs to be occupied. The receiver can be mounted onto the wall by screws and it is easy to stand the doorbell on a desk. You also can take it with you to the backyard, basement, garage or bedroom. WIRELESS DOORBELL WITH TOUCH BUTTON:The touch button is our design of door bells ringer wireless. With the function of IP44 dustproof and waterproof, higher sensitivity and lower energy consumption, the push button can be installed indoors and outdoors. FLASHING LIGHT DOORBELL:Wireless doorbells for home has 36 Melodies and 4 levels of volume range (mute-low-middle-high). The built-in big LED indicator additional assistance for the hearing impaired doorbell. LONG OPERATING RANGE UP TO 1000FT:The strong wireless signal of doorbell wireless is up to 1000ft in open area, will not interfere with other equipment in your home or those of your neighbors. EASY TO INSTALL DOORBELL:Easily install 3 AAA batteries in the receivers and fix transmitter (pull out the insulating sheet inside) to the door frame. Please do not install too close to the metal or the machine like television