EarFun Air Pro 4 - Left Earbud Only I'm selling these because I lost the battery case after using them a couple of times, which is a shame. A set of 5 ear tip sizes is included. Supports the latest Bluetooth 5.4, and features Qualcomm's cutting-edge "QCC3091" chip. aptX Lossless & aptX Adaptive, transmitting an overwhelming amount of information at a bit rate of up to 990kbps, allowing you to enjoy high-resolution and original sound sources. Compatible with LDAC & certified Hi-Res Wireless by the Japan Audio Society. Supports QCC Snapdragon Sound technology. EarFun's proprietary "QuietSmart 3.0" hybrid adaptive noise-canceling function reduces noise by up to 50dB. Supports next-generation Bluetooth audio LE Audio and Auracast™. Each left and right earbud has 3 high-performance microphones built-in, and the cVc 8.0 noise-canceling function and AI-powered algorithms provide clear calls anywhere. Up to 52 hours of playback. Multipoint connection. Supports Google Fast Pair. Wireless and fast charging. 50ms low-latency game mode for a seamless gaming experience. Wear detection. IPX5 water resistance (earbuds only). Other features... Noise canceling [From the seller] I am a non-smoker. I will clean and sterilize the item to a minimum extent before shipping. I will basically use recycled packaging materials for shipping. I will pack the item within a reasonable range to protect it from shocks and water. If you require more protection, please consult with me beforehand, as it will be an extra charge.