1. Bluetooth Version: 3.0
2. Transmission power: Class2
3， Radio Frequency: 2.4-2.48GHz
4， Transmission distance: 10 meters farthest
5， charging time: 2-3 hours
6. Talk time: 7-8 hours
7， product size: 105 × 75 × 155MM
8. Function: Bluetooth + card + radio
Instructions :
1， according to the answer key to the indicator red， blue flashing alternately;
2， opened the phone Bluetooth function and make it search for new devices 503
packing:
1*headphone
2*usb cable
