This trimmer is designed to be charged with USB cable, it fully charges in 8 hours and runs for up to 60 minutes. The stainless steel blades are self-sharpening, giving you a hassle-free trim as on day 1. You can choose from 1mm stubble comb or any of the 3mm, 5mm or 7mm beard combs, to get the beard length you want. Alternatively, you can remove the comb and get the zero trim look of 0.5mm. The battery indicators in this trimmer let you know what your battery status is low or charging. This way, you can charge your trimmer on time and you won’t end up with an empty battery in the middle of your trim.