Wireless Microphone Headset: Built-In High Sensitivity Condenser Microphone, Transmission Distance Upgrade To 160 Feet(50m) Signal Stability,   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 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,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, saving power and worry. Built-In Cardioid for Polar Pattern Condenser Microphone,Widely Applied To Conference,Speech, Web Podcast, Outdoor Live, Yoga Instructor, Voice Amplifiers, Dancing Instructor,, Game Etc.   Specification:   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: 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