REMAX RB-M28 is a waterproof Bluetooth 4.2 speaker with a range of 10 m and power of 2×5W. Equipped with a 45 mm speaker, 2200mAh battery (up to 8 h playback), impedance 4Ω and robust design. Frequency range: 60 Hz–18 kHz, weight: 580 g, size: 160×79×79 mm.

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Bluetooth version: 4.2
Bluetooth transmission distance: > 10 meters
Impedance: 4R
Sensitivity: 1000mV
Frequency response range: 60Hz-18KHz
Speaker specifications: 45 mm internal magnet 4R3W
Output power: 2 * 5W
Battery: 18650 2200mAh 3.7 V
Charging voltage: 5V
Product size: 160x79x79mm
Product weight: 580g
Standby time: 60 days
Playback time: 70% volume 8h
Distortion: 1%
Signal to noise ratio: 70 dB