The Lenovo HT18 True Wireless Earbuds features Adopting advanced Bluetooth 5.0 technology, the wireless Bluetooth earbuds have strong anti-interference capability, faster and more stable transmission, and can realize the synchronization of game sounds and pictures with low latency. The earbuds have incredible sound quality with deep bass and clear treble, bringing you an incomparable 3D surround music experience. Built-in high-definition microphone, intelligent noise reduction, delivers clearer and more real talking sound in stereo mode. It features intelligent noise reduction technology, and delivers a truly unparalleled clear sound quality, bringing you an amazing wireless music experience and call clarity. The earphones will automatically turn on and pair with the last device when removed from the charging pod. The TWS Bluetooth earbuds can be used in Mono or Twin mode. earbuds are ergonomically designed, comfortable to wear and not easy to fall off in sports, and will not make you feel pain in the ears after a long time wearing. It has no warranty