① Function key

② Volume+/Next song

③ Volume-/ Previous song

④ Indicator

⑤ USB Port for earphone/charging

Specification

Bluetooth version : V4.0

Main control chip : CSR

Operating distance : 33feet (7-10meters)

Battery capacity : 250mah Polymer lithium battery

Music playing time: 6.5-8hours（listening music alone)

Charging : suggest use DC5V1A adapter

Standby: ≈100hours

Signal-noise ratio >75DB,  Degree of distortion: <0.1

Support AAC,MP3,SBC,Stereo

How to use ?

1) Turn on phone bluetooth

2) long press the 1 button for 3 seconds, the green light will on . and then it become green and red light continously shining.  check the phone bluetooth find “XTC-258" paired

3) enjoy music and answer phone call

4) short  press button 2 and 3 can be next song /previous song , long press it, volume +/volume-

5) long press the 1 button shut down glasses .  red light shiing 1 time

This usb cable is the same as android usb, so if cable is missing or can not work , use android cable instead will be ok .