• Bluetooth version: V5.0
• Frequency range: 80Hz-18KHz
• Connection distance: 10m
• Speaker size: Φ40mm
• Impedance range: 4 Ω±5％
• Battery capacity: 500mAh
• Charging time: 2h
• Playback time: 4h 
• Charging interface: Micro USB
• Metal design

Choose Riversong Sp15 Bluetooth Speaker - Silver