TROUBLE SHOOTING :

Try reset the catcher & phone and pair again.
It will fix 90% issue if you have problem to connect.

First clear Dual Catchmon / Catchmon GO Record.  
(2022 ver. DuoMon/DuoMon Egg no need to do this step)

1. Press the LED button to BLUE light.
2. Press the Blue LED for 3 sec.
3. The LED will flash "blue-yellow" for 10 sec to delete the Bluetooth setting on Dual Cathcmon/ Catchmon Go. 
4. When the LED flash "green", it means the record are deleted. (device reset)

Then clear your Phone & Game  Record. 

• Go to phone settings > bluetooth > find "Pokemon Go Plus" > forget the device. 
• Go to Pokemon Go settings > Pokemon Go Plus > tap the triangle below.

Dual Catchmon / Catchmon LED