Bluetooth Handsfree Portable Speakers

We are offering bluetooth handsfree portable speakers,
parameter
bluetooth version：v2.1+edr
bluetooth transmission power: class2 4dbm
bluetooth working frequency：2.4ghz
charging voltage: dc5v500ma
working voltage ：dc 3.7v
battery capacity:600ma
music playing time：4h
talking time:8h
thd: ≤ 0.1% (3.7v1khz1.8w)
signal to noise ratio：≥65 db
speaker parameter :4ω3w ф40mm
bluetooth range :10-20m
"colour :red ,blue,green,
black,white,
"sell points
portable, hanging portable design
bluetooth wireless audio transmission
ariety of classic color for choice
with phone handsfree
computer small speakers
car bluetooth
"fm radio
"
card speakers.