Sensor Motion Doorbell MP3 Infrared Doorbell Wireless PIR Motion Sensor Voice Prompts Welcome Doorbell Entry Alarm Z3 | Doorbell (White) Features: Human Body Infrared Sensing and Motion Detection: The infrared doorbell has a 4-meter effective sensing distance, and it will play the prepared sound when someone enters the effective sensing range. Sound files can be replaced by yourself, just connect it to the computer with a USB data cable, then copy new sound files (MP3 format only) to the player. Your MP3 files will play automatically after the PIR sensor is activated. (Note: it can be recognized on Win7/XP computer, but it may not be recognized on Win 8/10 computer) Wide Use in Store: When it detects the human body passing by, it will give a warm welcome, greeting message, warning message, playing voice advertisement or anything else. Depending on the different applications, different sound files can be downloaded to achieve the appropriate effect. Two Power Supplies: Equipped with 3*AAA battery slots and a micro USB port, it can be powered by 3*AAA batteries (not included) or the included micro USB charging port. (Note: Does not support replacing sound via micro USB). Practical Anti-theft Function: When you leave the store, switch the sound to alarm sound mode, the recording player can induce and warn people who want to approach the store, scaring away thieves. Unique Design: Supports memory function, when you select sound and adjust volume, after the device enters sleep status, it can realize power-off memory function. Specifications: Model: Microsound V22.12 Product Type: MP3 Infrared Doorbell Audio Format: MP3 (bit rate: 8~320Kbps), excellent sound quality, two levels of volume for options: small or maximum. Built-in Speaker: 8ohm 1W speaker Sensor: Infrared induction, support automatic induction Power Supply: DC3V~5V stabilized voltage supply Working Current: ≤100uA (sleep mode at rest); ≤130mA (DC 4.7V) (playback mode) Infrared Induction Distance: ≤ 4 meters (45° angle) Sampling Frequency: 14KHz Memory Size: Built-in 4Mbit SPI FLASH memory Installation: Ceiling-mounted or wall-mounted Power Supply: External USB power DC 5V or 3 AAA dry batteries (not included) Working Current: Sleep status ≤ 100uA; Play status ≤ 60mA Humidity: 10~85% RH Color: White Main Item Size: 9.0 * 6.0 * 3.0cm / 3.54 * 2.36 * 1.18oz Main Item Weight: 60g / 2.1oz Package Size: 11.0 * 6.5 * 3.0cm / 4.33 * 2.55 * 1.18oz Package Weight: 81g / 2.8oz Package List: 1 * Sound Doorbell 2 * Mounting Bracket