" Wireless DoorbellThis doorbell has 1 receiver (battery powered) and 1 transmitter. Built-in button battery (not included), very easy to replace, transmitter battery can be used for more than 12 months under normal conditionsof use. Easy to use design to improve user experience. Ultra-Long Wireless RangeWireless range up to 300m without disturbing other devices in an open area, which won't interfere with other equipment in your home or your neighbors; makes sure you hear and respondat the bell in time. 58 Melodies to Enjoy We have carefully selected 58 very beautiful ringtones, fast, slow, relaxing and cheerful ringtones to choose from. 4 levels of volume adjustment suitable for multiple environments. We also carefullyadded a "quiet mode" design which is very suitable for use when a baby sleeps at home. Stylish DesignModern and elegant design in classic white, excellent materials that avoid high temperature and interference. Waterproof and dustproof remote transmitter button. Operates between -22F and 158F; resistto various adverse weather conditions. Wide Application of Wireless Doorbell The wireless doorbell kit can be used for various applications wherever you need it! Do you know the new wireless doorbell app? Elderly or Patient Assistance: This button can be used to call the elderly or the patient in case of emergency. It recharges automatically, requires no power and is easy to use. Call the kids in the morning: Do you want the kids to get up in the morning and go to school on time? Don't worry, press the home button and your child will wake up and not be late for school later. Ideal for homes, shops, offices: with our wireless doorbell you will never miss a visitor. "