M9 Wireless charging case gives you up to 40hrs playback without plugging in --- Bluetooth 5.0 --- Superior quality sound --- 4 built microphones give superior clarity for phone calls and zoom meetings --- 6hrs playback or talk time between charges --- 200hrs of standby --- Mono mode so you can still hear ambient sounds (this also doubles battery life) --- Touch controls and (including Siri/Google Assistant) Upgraded High Clarity Calls with 4 Microphones：Each earbud has 2 microphones (4microphones in total) which reduce background noise and enhance the clarity of voice pick-up when making a call or having a video conference. Mpow M9 comes with 3 (S, M, L) sizes ear tips with upgraded materials for more secure and comfort fit for office or sports.
eBay