The Calus Smart Live M10 Evo features Bluetooth V6.0 wireless connectivity, an oval charging case with a digital LED battery percentage display, and unique ear-hook/clip-style earbuds designed for secure wear and enhanced low-frequency sound.Bluetooth Version: BT V6.0Battery & Playtime: Offers about 6 hours of listening time per charge, with a 30mAh headphone capacity and a 300mAh charging case capacity providing up to 50 days of standby time.Audio Performance: Engineered for lossless low frequencies and deep bass response.