1. Product weight: 4g (single earphone).2. Working time: 2.5-3 hours.3. Standby time: 100/h for one ear and 60/h for both ears.4. Charging time: 1-2 hours.5. Single earphone battery capacity: 40mAh.6.Charger Box Betty: 350mAh.7. Wireless distance: 10m.8. Compatible phone: Earphones are compatible with Android , IOS , Microsoft and so on , 100% of the phone with bluetooth .Tips : If two earbuds has not paired  each other, please delete the paired information of earbuds as per operation of 3 steps first, then long press power button of both earbuds 5 seconds to into pairing mode, the left earbuds will flash blue and the red LED of right earbuds will turn off when they paired each other successfully.The earbuds will turn off if it can't paired within 5 minutesg time to charge it.Notes:1.Due to the difference between different monitors the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2.Due to the manual measurement and different measurement methods please allow 1-3cm deviation.