Infrared induction voice broadcaster. Wireless loudspeaker with 120dB volume, no fear of noisy environment, supports multiple voice broadcasting methods, easy to use Get you more functions: infrared induction voice player, human body induction automatic alarm, Bluetooth connection U disk connection, 8MB storage voice content switching, computer connection recording file storage, 120dB high volume Infrared human body induction 10m detection distance. Using radar human body induction technology to automatically sense the moving human body, enter the sensing area and automatically broadcast the prompt voice. You have entered the construction site, please wear a helmet! Bluetooth connection, U disk external playback. Support Bluetooth/U disk function, wired constraints, compatible with various mobile phones, and other Bluetooth devices Product model: KP500B-P Working voltage: DC9V1.5A Product volume: 120 decibels Working principle: human infrared induction Sensing range: 10 meters away, angle 120 Support audio: MP3WAV format Connection method: Bluetooth U disk Product size: 175X217X85mm Product weight: 782g Color: White Material:Plastic Package Contents: 1 * Window Intercom Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.