Operation guide as followed:
1. Power on/off: long press the MFB
2. Answer a call: press the MFB once while a coming call
Reject a call: press the MFB once while calling
Redial: press the MFB twice
3. Adjust volume: "+"， press once， "-"， press once.
Change song: "+"， press for 3s to previous song; "-"， press for 3s to next song.
4. Indicator light:
The battery is low: red light flash every 10s
Pairing mode: red and blue light flash alternately
After fully charging: red turn blue
5. How to pair?
1) make sure that your earphone is off.
2) long press the MFB until the light turn red and blue alternately， then let your hand go. It will enter pairing mode.
3) open your phone's Bluetooth， click to connect.
4) If need password， just enter "0000"
6. How to connect to two phone?
1) turn off the first phone after it finishes to connect to the Bluetooth earphone.
2) connect to the second phone following the previous steps.
3) then open the first phone's Bluetooth and connect.
Specifications:
| General Specification | |
| Brand | GENAI |
| Model | Blue3 |
| Color | Black， White |
| Wearing Type | Earhook wearing |
| Product Weight | 7.9g |
| Technical Parameters | |
| Connectivity | Bluetooth technology |
| Conectivity Interface | Charging port |
| Output Power | 1mW |
| Receive Sensitivity | 100dB |
| Impedance | 32Ω |
| Frequency Response | 20-20000Hz |
| Bluetooth Version | Bluetooth V4.0 |
| Transmission Range | within 10 meters |
| Talking Time | 4-5 hours |
| Media Playing Time | 3-4 hours |
Package Included:
 | 1 x GENAI Blue3 |
| 3 x Ear hooks | |
| 2 x Ear caps | |
| 1 x Charging Cable |