Power supply: DC5V USB adapter and built-in 500mAh lithium battery, rechargeable, charging protection.
Infrared human body motion detection, 120° view angle, 16ft (5m) detection range. Audio will play automatically after the motion is detected. The infrared detector can be rotated around 60 °, easy to adjust the detectable area.
128M micro SD card included. Can insert micro SD card to play directly. The device is also built in 4MB Flash memory. Sound files can be changed. Insert micro SD card to transfer sound files to internal Flash memory.
3.5mm audio interface for external speakers, can connect external speaker to have louder sound.
Wide Applications: Perfect for elderly or those with memory loss that need voice reminders, alarm, warning signs, safety voice attention, voice advertising, door greeter / welcomer etc.