Bluetooth version: V4.2+BR Speaker Size: 3 inch*2 Amplifier output: 10W*2, 4Ω RMS Battery Capacity: 3.7V, 3600mAh Play Time: up to 12hours depending volume Frequency Response: 59Hz-20kHz Bluetooth connecting range: 10m IP rating: IPX6 Two wireless stereo ( link two speakers to get left and right channel seperation ) Boost mode ( more dynamic sound ) Product size: 283(L) *123(W) * 126 (H) mm.