Rated Power:4mW; Bluetooth Transmission Distance   Appr:10m; Bluetooth Version Bluetooth 4.2; Music Time Appr:2.5H; Talk Time Appr:2H; Standby Time Appr:40H; Charging Time Appr:1H; Battery Capacity:400mAh; Material:ABS + Aluminium alloy; Earphone Size:23.6 x 16.3 x 23..7 mm; Earphone Weight Appr:9g; Total Size:φ32 x 81.15mm; Total Weight Appr:70g