Please include the specifications of the order product when filling up your order. On the lower part portion of product image, then click "add note" to specify your prefer color, memory and specification.
(ex. Vivo V15, 128gb, 6gb RAM, Coral Red) (ex. BT HF PRO SY BT1607, Red) 
 
PRODUCT FEATURES
1. Wireless version: V4.2 +EDR
2. Wireless transmission Dustance: 10 meters:
3. Frequency response range: 100hz-20KHZ
4. Signal-to-noise ratio: *4 db or higher
5. Sensitivity: 80db+ 2 db
6. The output power: 3W*2
7. distortion rate of 116 or less
8. the speaker specifivcation: 4, 3w 57mm
9. input power supply: DC5v500mah
10. working voltage: 3.7 v
11 playing time/ charging time 180min/120min