Product model: TW13 Bluetooth headsetBluetooth version: Jerry V5.0Transmission distance: barrier-free distance 10-18 metersProduct speaker: high-quality true copper ring speakerProduct chip: true stereo chipWorking time: 3-4 hoursCharging warehouse standby time: 60 days +Headphone battery capacity: pure cobalt 40 mACharging compartment battery capacity: pure cobalt 300 mAh (with IC protection board)