Solution:  BK4.2;           Can do  IPX7 WATERPROOF    

Power output: 3W

Funcion: BT

Speaker:40MM 4Ω 3W

Battery Capacity:300mAh;

Voltage:DC 5V

Transmission distance :10M;

S/N ratio:≥80dB

Frequency Response:20HZ-20KHZ

Distortion:≤0.5% w1K Hz

Working time:1.5hours

Charinging time:2hours

Color:black/white/blue/pink/red
Material: ABS plastic

Accessories:Charging Cable,manual

Bluetooth version:4.2

speaker: 4Ω/3W  52MM

function: BT/TF card/FM/ handfree/AUX/USB

battery capacity:400mAH  

Transmission distance  :10M

m input :DC 5V

Output voltage:3.7V-4.2V

frequence :80HZ-20KHZ

S/N Ratio: ≥80dB

Output distortion rate≤0.5%
playing time:1-2hours

charging time:2 hours

Color:black,red, blue,yellow,grey
material:ABS+fabric
Accessory:USB  cable ,manua