YENKEE Pocket speaker

Pocket speaker for mp3 players, mobile phones, PC, notebooks, tablets etc. Twist, unroll, plug and play. 360° "take away" audio experience.
Loudspeaker Output (RMS): 0,75 W (4 Ohm)
Speaker Diameter: 36 mm
Frequency Response: 100 Hz - 20kHz
STN: ≥85dB
Power Input: DC 5 V (USB)
Battery: 200mAh, 3.7V (Lithium)
Charging time: approx. 60 min.
Operating time: 3 to 4 hours (depends on volume)
Battery level indicator: red LED (turns off when fully charged)
Dimensions: 50 x 50 x 35 mm