Hello! I purchased these new and used them a few times, but they didn't quite suit me. They've been charged less than 5 to 10 times, so the condition is subjective, but I think it's good. I appreciate your understanding that these are used items. Below is a copy of the product description: Earphone body (one side) 4.1g, Charging case 41g, a compact size for comfortable listening and portability. Stylish two-tone color and solid design. Powerful high-quality sound Sound tuning based on the audio brand KENWOOD's unchanging philosophy of "original sound reproduction." With a 6mm diameter high-power neodymium driver, it achieves natural and clear vocals, soaring highs, and powerful lows. The housing fits the ear and further enhances sound insulation. Stress-free use, Up to 30 hours*1 Long playback Earphone body 7.5 hours*1, Charging case 22.5 hours*1 Up to 30 hours*1 of long playback. You can enjoy music all day long without worrying about the battery. *1: Varies depending on usage conditions. Waterproof specification*2 that is resistant to rain and sweat Waterproof specification*2 that protects the earphones from sudden rain, sweat during sports, and splashes. *2: Equivalent to JIS protection level 5 (IPX5). Earphone body only. Equipped with a microphone that can be used for telework and online classes Can be used with only one ear, so you can listen to music while keeping one ear open or make hands-free calls. Accessories ・Charging USB cable ・Charging case ・Ear tips (XS/S/M/L each 2) Model number KH-CRZ40T Color variations -B (Black), -W (White) Type Sealed type Driver unit 6mm diameter Communication method/output Bluetooth® standard Ver.5.1, Power Class 1*3 Supported codecs SBC Supported content protection SCMS-T method Battery life*1 Earphones: Up to 7.5 hours, Charging case: Up to 22.5 hours (Total: Up to 30 hours) Charging time*1 Earphones: Approximately 2 hours, Charging case: Approximately 3.5 hours Weight Earphones (one ear): Approximately 4.1g (excluding ear tips), Charging case: Approximately 41g *1: Varies depending on usage conditions.