27pcs led headlamp:27pcs led, brightness for led is 12000MCD, useful time is 100,000hours, use 1.5V AAA dry batteries. 27pcs led headlamp:1). 27pc LED light, brightness for each LED is 12000MCD, useful time for LED light is more than 100,000 hours. 2). The headstrap can be adjustable 3).use 3pcs 1.5V" AAA" dry battery. (not included) 4). output power:4.05W Battery Replacement:1).Twist to open ...