·Mobile power flashlight sound card
 ·Quality support materials: aluminum stereo bass
 ·Support MP3 player, MP3 speaker, flashlight, alarm whistle, bicycle stereo, U disk "Emergency Kit" and so on
·Resistance: 4ohm
 · Speaker: 45MM diameter within the magnetic 4Ω 3W dual magnetic
 ·Output power: RMS 3W THD = 10%
 · Audio power: 90Hz
 · Whole SNR: ≥ 70dB
 · Charging power supply: DC 5V-1A
 · Charging time 3-8 hours (3-5 hours charger, USB computer charging need 7-8 hours)
 ·Operating Voltage: DC 3.7V