Features: Portable wireless lavalier microphone to effectively amplify stronger sound. 80~12500Hz frequency response, high sensitivity and clear sound quality without hum and crackle noise. Clip-on lavalier microphone and belt pack transmitter design allows you more comfortable and enjoyable during speech. Operating range approx. 20 meters at open area. Microphone cable length up to 100cm/39in, transmitter with volume control and LED indicator, 6.35mm plug wireless receiver. Powered source: 1 * 9V battery for transmitter, and 1 * AA battery for receiver. Easy for operation, great for giving a speech, lecture, conference, promotion, visiting guidance etc.