VANGUARD ST-425 Stereo Over-ear Wireless Bluetooth Headphone

Model: ST-425
Pickup: Condenser
Reverb Mode: Echo reverberation 
Impedance: 4ohm
Sensitivity: 80db-115db
Output Power: 10mW
Speaker Output Power: 3W
Frequency Range:20Hz-20kHz
Max SPL: >=115dB
Charging Voltage: DC 5V
Charging Time: 1 hour
Using Time: 3-4 hours
Built-in polymer battery: 450mAh
Main Item Size: Approx. 18.5 * 18 * 7.5cm
Main Item Weight: Approx. 300g 
Package Size: Approx. 20 * 8 * 20cm 
Package Weight: Approx. 360g 

ST-425 Package List:
1 * Microphone
1 * USB Cable
1 * 3.5mm Audio Cable