Features: Brand new and high quality. Wireless Microphone Headset System: Built-In High Sensitivity Condenser Microphone, Transmission Distance Upgrade To 160 Feet (50m) Signal Stability, No Delay, No Radiation, Anti-Howling, Anti-Jamming , Constant Frequency , Clearer Sound Quality. Charge And Work Of Wireless Microphones: The Transmitter And Receiver Are Built-In 120 Mah Rechargeable Lithium-Ion Batteries That Can Offer About 6-8 Hours Working Time. Usb Cable Has Two Micro Usb V2.0 For Charge For The Transmitter And Receiver At The Same Time, Fully Charge Is Only 2.5 Hours. Perfect Application: The Plug On The Receiver Is 6.35mm. For 3.5mm jack,Please Use The Additional 3.5mm Adapter(Included)To Connect More Equipments. Humanized and thoughtful design: the microphone will automatically shut down if you do not use the microphone within 45 minutes of no operation, saving power and worry. Built-In Cardioid Polar Pattern Condenser Microphone,Widely Applied To Conference,Speech, Web Podcast, Outdoor Live, Yoga Instructor, Voice Amplifiers, Dancing Instructor, Promotion, Game Etc. Specification: Audio Signal: Digital Sampling 16bit - 16KHZ Frequency Response: 100HZ-15KHZ Transmission Distance: 50M Transmission Power Consumption: < 15MA Reception Power Consumption: < 10MA Battery Type: Lithium Ion Battery Charging Time: 2hours Continuous Working Time :6-8hours Frequency Band: 2400-2483Mhz Modulation Method: GFSK Package includes: 2 * Headset Mic Transmitter 1 * Receiver 1 * 6.35mm to 3.5mm adapter 1 * 2 in 1 USB cable 1 * User Manual Note: Does not support mobile phones, Bluetooth speakers, PC, or laptop use. Adapter color: gold and silver random delivery. Please refer to the measurement. Tiny measuring error is allowable in normal range. There might be a little color difference due to the monitor, camera or other factors, please refer to the physical item.