Good speed controller. there is emphasis. enough power for the eyes. I drilled wood with a 50 mm pen with no problems. I did not use the percussion mechanism, there was no need. And now I also bought a perforator. She has 2 speeds, but the speed is enough for 1st speed, so I don’t turn on the 2nd one. In general, in vain they put the gearbox only added weight. Convenient suitcase.