Logitech R400 patent

Because of low power, it is not bright enough. That is to say, the power of the laser pen you bought is not as big as that of a red pen with tens of dollars.

We have never sold genuine Logitech laser pens, which are more expensive and few people need them. I didn't know there was a genuine how bright.

There are two situations you said.

1: Logitech R400 battery is low.

2: You bought imitation Logitech. Eighty-nine percent of the market is imitation.