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♚Equipment * 1 ♚USB charging line *1 ♚Wireless microphone *1 ♚Microphone charging line *1 ♚Products brochure *1 Data sheet ♚Frequency response :50Hz--12000Hz ♚Output power: 15W ♚Charge voltage :DC 5V 1A ♚Charging time :4-6 hours ♚Music time : 6-8 hours ♚Amplifying time :7-10 hours ♚Operation temperature : -10℃45℃ ♚Widely used: It is so convenience for teacher, presenter, salesman, coach, instructor, or people who has a soft voice, Parkinson's disease, vocal cord is paralyzed or whisper,etc. Our email:[email protected]