Product Name: ONIKUMA Model: B30 Color: Blue Compatibility: Applicable to most devices Connection Method: Wireless / Wired Wireless Version: V5.4 Communication Distance: About 15 m Audio: Loudspeaker Impedance: 32 Ω ± 15% Loudspeaker Diameter: 32 mm Frequency Response Range: 20 Hz – 20 KHz Sensitivity: 108 dB ± 3 dB Power: Working Current: < 50 mA Battery Capacity: 500 mAh Charging Time: About 2 hours Playback Time: About 10 hours Charging Interface: Type‑C USB