It’s mini speaker with built in rechargeable li ion battery, recharging the internal li ion battery via USB cable, this speaker can be compatible with pc,mp3,mp4,iphone,ipod,cell phone and any devices with 3.5 mm audio jack headphone jack. the compact design makes them perfect for travel to fit in bag and backpack.

Features:

RMS：2.0W

Frequency response: 100HZ-- 20KHZ          

SNR≥89dB

Output: 4.2V/250MA

Power supplier: Li-ion battery

Speaker drivers: 2W/4Ω

Dimension: 60x55 mm(approx.)

Weight: 65g

Accessories: USB / audio cable

Available Colors: Black/White/Red/Green/Pink/Purple/Orange/Blue