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