General description The 2X Sensor Motion Door Bell Switch is an innovative MP3 infrared doorbell that utilizes a PIR motion sensor to provide a convenient and efficient way to alert you when someone is at your door. With excellent sound quality and customizable volume levels, this doorbell is perfect for any home. Technical specifications Model: Microsound V22.12 Product Type: MP3 Infrared Doorbell Audio Format: MP3 (Bit Rate: 8 ~ 320Kbps) Built-in Speaker: 8ohm 1W Speaker Sensor: Infrared Induction Power Supply Mode: DC3V ~ 5V Stabilized Voltage Supply Working Current: ≤ 100uA (Sleep Standby Mode); ≤ 130mA (DC 4.7V) (Playing Mode) Infrared Induction Distance: ≤ 4 meters (45° Angle) Sample Rate: 14KHz Memory Size: Built-in 4Mbit SPI FLASH memory Humidity: 10 ~ 85% RH Color: White Material: ABS Size: 90 x 60 x 26.6 mm Installation Ceiling mounted or wall mounted Power supply: External USB power supply DC 5V or 3 AAA dry batteries (Not Included) Usage Ideal for home use as a