Model: i9s automatic matching (with pop-up window) Bluetooth version: V5.0 Speaker: high quality true copper ring speaker Chip: true stereo chip Playing time: 2-3 H Headphone battery capacity: pure cobalt 40 mAh Charging box battery capacity: pure cobalt 400 mAh (with protective plate) Effective distance: 10+M Headphone weight: 33g (including charging box), 7g (a pair of headphones) Package weight: 113g Packing size: 885.5cm Standard configuration: earphone*2 + charging box + mircoUSB charging cable + manual + packing box + silicone box + carabiner