Feature: Bluetooth solution: 5.0 Jerry 6983/5.0 Qualcomm 3020 (ENC noise reduction) Product speaker: 32Ω true copper ring speaker (dual microphone) Standby time: 120 hours Working time: 10 hours Charging time: about 1 hour Communication distance: 10 meters without obstacles Appearance material: ABS plastic (UV injection) Headphone battery capacity: 90mAH (with protective plate) Charging box battery capacity: full 500mAH (with IC protection board) Note: The first option is a single earphone, the second option is an attached charging case