Features: 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 lightweight, 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 115x86x35mm/4.53x3.38x1.38in Interfaces Type: USB Connection:Wireless BT4.2 Output Power Sound channel: independent sound channel Power supply: battery 2200mAh Extended storage: 16GB Effective distance: 50metres Playback time: 10-15hours Case Component: Plastic Color: Black/Rose Gold Package Includes: 1Set Sound Amplification with Microphone note: Due to the problemsof lighting effects and shootingangles, there will be tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurement.