Description: : Speech teaching microphone has frequencies for each channel, less prone to electric appliance interference and offers stable signal transmission. 30m transmission receiver, low distortion, low noise, makes the vocals are more prominent. Universal, fits for microphone, speakers, amplifiers, computer, etc. Head Wear Mic, plug and play, optional SIngle Headset/Dual Headset, to meet your needs in different situations. Portable: Handheld microphone, Headset Microphone,easily change the handheld to headset. Small size for easily carring. 450mAh built in battery for long time use. Multifunctional: Professional Mic designed for vocal use in live performance, sound reinforcement, studio recording, class, public speaking and trainings, free your hands and mind. Specification: Frequency range: 2.4GHZ-2.4835GHz Sensitivity: -35dB Battery Specifications: 450mAh Power supply mode: built in battery 5V Use time: about 8 hours Use distance: about 30 meters Microphone pointing: unidirectional Transmitter weight: about 30g Connection method: 2.4g Size Chart: 10cmx5cmx8cm/3.94inchx1.97inchx3.15inch Package Includes: 1 Pack Microphone Kits Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!