... mark, coffee spot, freckle, senile plaque, pigment from outside injure, black, blue tattoo, eye line, eye brown and lip line etc ... water cooling systemProtecting System: Cut watersupply, double protectionSystem total Consumption: ≤ 2.5KVATemperature: 5_40CRepeat Frequency: 1064nm: 1, 2, 3, 5, ... V, 50 Hz+/-1 Hz; AC110V+/-20V, 60+/-1HzRelative Humidity: ≤ 80C Black baby yag laser treatment heads: