1、Using infrared pyroelectric principle to sense human activity information, when someone enters its sensing range, it can accurately identify human activity information. 2、Large sensing angle and sensitive triggering. Intelligent triggering, no manual operation is required, and voices such as warm reminders, alarms, and greetings are issued as soon as the human body is detected. 3、Can switch different voices at any time according to different applications. 4、Powered by DC5V power adapter (Micro Usb interface) or 3pcs 1.5V AA dry batteries (not included). 5、Adopt mature human pyroelectric induction technology, the induction distance can reach 4 meters/13.1ft. 6、Support voice file replacement (audio file format: MP3 bit rate: 16 - 320Kbps). 7、Low voltage alert function, making it safer to use. 8、LED digital tube display, it can display the currently playing track and volume level. 9、Support button to switch up and down song and volume adjustment. 10、Built-in 8R 2W speaker, the sound is clear and loud. 11、Rainproof design, which can be used outdoors (waterproof rate IP43). 12、Use universal bracket to facilitate installation and adjustment. Condition: 100% Brand New Item Type: Infrared Voice Prompter Material: ABS Main Color: Silver Power Supply: DC5V Power Adapter (Micro USB Interface) / 3 x 1.5VMA Dry Batteries (Not Included) Power Supply Mode: Standby State: ≤200uA Playback Status: ≤600mA(DC5V) Audio Format: MP3 Bit Rate: 16320kbps Audio Output Power: 8 Ohms / 2W (Typical Value) Sensing Range: ≤ 4 Meters/13.1ft (120 ° Viewing Angle) Volume: ≤100db (horizontal Distance 1m/3.2ft) Waterproof Rating: IP43 Operating Environment: -20 ℃ - 35 ℃ Relative Humidity: 10 - 85% Rh 1 x Infrared Voice Prompter 1 x Bracket 1 x Mounting Screw Bag 1 x Instructions 1 x 1 x USB Cable