This bluetooth speaker has metal design and hd sound mini & compact super bass.

Metal Design HD sound mini & compact Super bass Model: SP15 Bluetooth version: V5.0 Bluetooth solution: HFP, HSP, A2DP, AVRCP Frequency range: 80Hz-18KHz Connection distance: 10m Impedance range: 4 Ω±5％ Battery capacity: 500mAh Input: 5V == 0.5A Charging time: ~2h Playback time: ~4h (volume at 70%) Charging interface: Micro USB Net weight: ~120g