How to use Enjoy mini wireless buzzer

One kit Enjoy wireless mini buzzer system includes: 1 remote controller + 8 mini buzzers + 8 recharge cables

Spec:
Wireless, Cordless, put and play
With light and sound
Standalone design, no need computer, no need software
Lockout
Continue answering
Remote control
Rechargeable, 1 hour recharge, 6 hours use
Battery display
No cheating
8 players
Portable and affordable

[stoplapub]

Hi, how to syncronize button with the remote? some button are working, but other blinking for a moment and turn off.
regards