WIRELESS DOORBELL BATTERY OPERATEDJSIEEM flashing doorbell 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 BUTTONThe touch button is our new design of doorbell 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 DOORBELLcordless doorbells wireless has 36 Melodies and 4 levels of volume range (mute-low-middle-high). The built-in big LED indicator offer additional assistance for the hearing impaired. LONG OPERATING RANGE UP TO 1200 FeetThe strong wireless signal of door bells wireless cordless battery operated is up to 1200 feet in open area, will not interfere with other equipment in your home or those of your neighbors. EASY TO INSTALL DOORBELL CHIMEEasily 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, WiFi equipment, computer, etc.