Mono Use: Each earbud can be used independently no matter left or right one, you can use any earbud alone for mono playback or for calls. Wireless charging: Earbuds can last up to 6 hours on a single full charge, you can put the charging case on any Qi charging pad or connect it to USB-C cable, It will recharge 3 times for the earbuds, you can go for a day without power shortage.(Volume +/- will only works with IOS). IPX4 waterproof: IPX4 rated waterproof keeps your headphones from sweat or light rain, ideal for workout, outdoor sports and daily commute. Firmware update: You can get newest features with latest update, Libratone Track Air will become more versatile and powerful. UK / Auatralia / Canada. The item "NEW Libratone Track Air True Wireless Active Noise Cancelling Earbuds" is in sale since Thursday, June 11, 2020. This item is in the category "Cell Phones & Accessories\Cell Phone Accessories\Headsets". The seller is "dealnieoe0" and is located in Hong Kong. This item can be shipped worldwide.