Want to have smoother and more healthy hair? This portable comb is only 10cm long when folded, and releases negative ions to lock the moisture on your hair, neutralise the static charge to result in smoother hair. Active ions also kills bacteria and reduces dandruff. Used on damp hair for 2-3 mins for best results. Operates on 2 AA battery 3V,power <1W. Negative ion content: 0.5-1 millions /cm3, ozone content: 0.2MG/H.