La description

●4.1+EDR
●CSR
●RF Transmission power:*0DB
●channel:Class 2
●size：L*8*W*3*H9.5MM
●N.W：*3.9g
●Transmission range:*0m
●Talk time: 4 H  Music time: 3.5 H
●Charging time: 1.5 H standby time: **0 H                  
●Function: enjoy the music ;answer and end the phone; refused to call; the last number redial; volume control, etc.
Feature
●Support HiFi Stereo sound for music enjoyment
●Battery capacity display for IOS / Android samrt phone 
●Support call receive function, stereo high definition music, the last number redial
●Can connect 2 mobile phones at the same time
●Voice prompt in English. Voice alert announces connection status
●DPS Noise Reduction technology
●Easy set up with Bluetooth phones
●Designed to comfortably fit either ear
●Noise reduction technology for clear calls
●Hear your music, GPS directions, and more