1. One-click noise cancelling 2. One key to mute 3. CD sound quality 4. 40-hour long lasting battery life (with charging case) 5. Playback without unplug pass-throught charging 6. 200m transmission range 7. Supports external microphone 8. 360 degrees omnidirectional sound pickup 9. Plug and Play Specifications: Wireless transmission: 2.4GHz adaptive frequency hopping Polar pattern: Omnidirectional Max sound pressureLevel(SPL): 112dB Sampling rate: 48KHz type of battery: LiPo battery Microphone frequency response: 20Hz-20KHz Charging time: TX: 1.5 hours, charging case: 2 hours Endurance: TX: 7 hours, charging case: simultaneously charge 2 TX for more than 4 times Input dynamic range: 87dB Transmission range: 50m (free movement), 200m (LOS) Bit depth: 16bit