♫【New Upgraded Wireless Microphone Headset】❶Compatible more devices, iPhones, Android, Desktop, Voice Amplifier, Home & stage speakers, mixer. ❷Thickened hose, prevent shaking during strenuous exercise. ❸3 Battery power indicators(33%/66%/100% battery left), prevent accidental power off during use. ❹Battery capacity, increased from 300 to 450 mAh. ❺Plug and play, automatic pairing and light in blue at boot. | ♬【Excellent Uhf Wireless Mic Performance】Upgraded Bietrun wireless microphone, fcc certified uhf independent frequency bands, high-sensitivity condenser microphone. Stable & Comfortable ●165 feet (50m) transmission distance ●Signal stability ●No delay ●No radiation ●Anti-howling ●Anti-jamming ●Constant frequency ●Clearer sound quality ●Handheld & headmounted 2 in 1 ●TRS/TRRS Converters( 6.35 to 3.5mm port) | ♫【Prefessional Head MIC for Teacher, Coach】At class, Yoga gym, speech, church and tour guiding, Teacher/Coach's voice is clearly received by Wireless Headset MIC, then amplified by Voice amplifier/Home & stage speakers/Portable pa system/Mixer, or recorded by iPhone/Android/Samsung/Camera/Desktop PC/iPad. iPhone 7 & above need lightning to 3.5 mm converter. Not Supported: Bluetooth Speaker with aux jack, Laptop, iMac, Macbook. | ♬【Charge & Work of Upgrade Microphone】Built in newly upgraded 450 mah rechargeable lithium-ion batteries, transmitter and receiver can be charged simultaneously with the dual usb v2.0 cable head. fully charge is only 2.5 hours, working time upgraded to 7 hours. | ✔【What If I Can't Pair or No Sound】Please pair if flashing blue❶turn on transmitter and long press key “+” for 10 seconds, indicator light starts flashing blue. ❷turn on receiver, wait for auto pairing about 10 seconds. ❸indicator light stops flashing after a successful pairing. note: it's a microphone device for voice input, no auditory function, no speaker. 1-year warranty, contact if any questions.