Specs:
•Bluetooth version: V4.1
•Tranmission distance: 10m
•Output sensitivity: 100dB
•Microphone sensitivity: 42 +-3 dB
•Battery capacity: about 50mAh
•Playing time: 3.5Hours
•Standby time: about 100Hours
•Charging time: about 1.5Hours
•Product net weight: 3.8g
Package included:
1 x Remax RB-T21 Earphone; 1 x USB Charging Cable