Purchased around November 2021. It's relatively clean as it hasn't been used very often. About 1-2 weeks ago, I confirmed that it works fine by charging it with a USB Type-C cable and by testing the Bluetooth and 3.5mm audio cable connections. Please note that I haven't tested the microphone function. I will also include the dedicated pouch shown in the second photo. The charging cable and audio cable are not included. I apologize for the inconvenience, but please prepare them yourself. Below are the detailed specifications: ---------- QCC3034 Chip & High-Quality Codec CVC8.0 Call Noise Cancellation 50 Hours Continuous Playback & Wireless/Wired Over-Ear & Comfortable Fit 【QCC3034 Chip & High-Quality Codec】The COUMI M10 uses the QCC3034 chip and, with stable Bluetooth 5.0 transmission technology, achieves low power consumption while maintaining high communication stability and long playback time. In addition to the 40mm dynamic driver, the headphones support high-resolution codecs such as aptX HD, aptX, AAC, and SBC, minimizing audio delay, allowing both iPhone and Android users to enjoy music and video playback. 【CVC8.0 Call Noise Cancellation】CVC8.0 (Clear Voice Capture) is Qualcomm's software technology primarily designed to clarify your voice during voice calls. It separates the input voice from other noises with software, providing high-quality sound while ensuring clear call effects. Specifically, it removes noises such as wind noise while walking, and noise from trains and cars. 【Customer EQ App Support】The COUMI M10 supports an equalizer (EQ) app, allowing you to customize the sound quality to your liking. It can be used on both iPhone and Android, and five default equalizers are available, selectable from Classic/Pop/Jazz/Rock/Folk. You can enjoy sound quality optimized for you, regardless of your smartphone or sound source.