Product introduction: 1. 433MHz home remote control digital LED wireless doorbell induction doorbell 2. Level 3 volume adjustment, 38 pieces of music; 3. No mercury, lead, and ultraviolet rays, green energy protects the earth with zero pollution; 4. Simple installation The sensor should be installed at a height of about 2 meters, and the receiver can be plugged in 5. Built-in dual speakers, clear sound, especially suitable for home, office, factory, store, security, welcome and other places 6. Infrared probe is adopted, 3.6 million rotation 120 sensing area, sensing distance is 3-7 meters. 7. Security anti-theft alarm, when there is no one at home during the day and night, someone opens the door of the home, and the doorbell rings to trigger the anti-theft alarm to protect the safety of family members and property. 8. For hotels, guesthouses, guest houses, shops, offices, warehouses, office buildings, otherVilla courtyard, home and other different occasions. 1. Receiver working voltage: 110-240V 2. The working voltage of the transmitter: 4.5V (3 AA batteries are not included) 3. Receiver button: 1) Music: 38 pieces of music are optional, the music logo button on the side can be adjusted 2) Volume: three-speed volume adjustment (high, medium, low) side volume logo button to adjust 3) Sound and silent can be set (sound: sound + indicator light, silent: indicator light) 4. Working distance: up to 70 meters 5. Transmitter sensing distance: 3-7 meters