This is an infrared induction doorbell with a robust structure for high durability. The infrared induction distance is from 3 meters to 7 meters. This high-quality doorbell is an ideal addition to your household.

• Receiver: 513 DC.
• Working voltage: 3V (2 x 1.5V AAA).
• Working current less than 120mA.
• Music choice: 4-chord 20 sounds.
• Sonority more than 75dB (2 meters away).
• Remote control range: about 150 meters (in the open air).
• Working voltage: 4.5V (3 x 1.5V AAA) or 9-15V (250mA) adapter (not included).
• Working current: sensor alarm less than 120mA, transmitter less than 15mA.
• Induction distance: 3-7 meters.
• Induction angle: 110° (fan-shape angle).
• Receive/transmit distance: about 150 meters (in the open air).
• Working radio frequency (receiver & transmitter): 433.90MHz/315MHz.