Be carefull with the powerbank, the usb ports are a little fragile, as is the unit itself. Its not very resistant to knocks and bumps. I prefer rechargeable eneloops, they last very well. 75 rounds last sesion and the battery indicator never moved, dont leave the batteries in the unit when you put it away.
Is it failing to trigger on the shot which is often a positional issue in relation to the muzzel or is it triggering ok but not acquiring the target? which can be a point of direction problem or minor settings issue.
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