DuraPower technology: 4x longer battery life. Battery Type : NiMH Charging: USB charging , 8 hours full charge ; Stainless Steel Blades for long-lasting sharpness Run time : 30 minutes Operation : Cordless use ; Comb: 1 beard comb (5mm) and 1 stubble comb (1mm) Adaptor : Not included ; Automatic voltage: 100-240 V Precision (size of steps): By 1mm