Universal for Bluetooth device
RT-558 স্পোর্টস ব্লুটুথ হেডফোন
Use: Universal for Bluetooth device（as Android/ios mobile phone）
Color: Gold/Black \Bule\Red
Bluetooth version: 4.2
Job scope: > 10 meters (disabled)
Standby time: > 180 hours
Lifetime: > 3~4 hours
Charging time: 1 hours
Support agreement: A2DP, AVRCP, HSP, HFP
Frequency response: 20 Hz 20 kHz
