Kinetic Dynamo Dynamo Torch with 3 Leds & Wrist Band. to Use the Light with the Kinetic Dynamo Dynamo Power, You Must Continue to Press the Side Tab. to Use the Light with Battery Power You Must Press the Side Button (Either to Turn It on or Off). Includes 3 Ag10 Batteries. 100 x 50 x 25 Mm; Certificates Available: Msds, Emc, Emc Minimum Quantity: 1