Features: Wireless connection: Support wireless connection, convenient and flexible to operat Teacher-specific : specially for teachers to meet the demand for sound amplification in classroom teaching. Suitable for use by guides in outdoor scenario and more .Horn Shouter Function: with horn shouter function, suitable for use in outdoor activity or gatherings. Lightweighted: small and lightweighted, easy to carry and use, suitable for mobile working environment. Functional loudspeaker: can be used for teaching, guided tand outdoor shouting in a variety of scenario, flexible application. Sound transmission: Provide highly sound transmission ensures clear and stable sound, not easy to be distorted. Specifications: Size:about 129x92x49mm/5.08x3.62x1.93in Interfaces Type: USB Connection:Wireless Output Power Sound channel: independent sound channel Power supply: battery 2500mAh Extended storage: 16GB Effective distance: 50metres Playback time: 8hours Color: As Pictures Package Includes: 1Set Sound Amplification with Microphone note: Due to the different monitors and light effect, the actual color the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring difference due to manual measurement.