Simson Simmy lighting set The Simmy lighting set has a silicone housing and a universal silicone mounting strap. This allows you to easily attach the lights to, for example, the seat post or the handlebars. The lights achieve a very good light output of no less than 29 lux for the front light, and 13.5 lux for the rear light! The push button is easy to operate, even with gloves or wet hands. Specifications: Color: black Material: silicone Type of lighting: LED Power supply: batteries Batteries: 4 x CR2032 (included) Light output: 29 lux (front), 13.5 lux (rear) Mounting: on handlebars and seat post Contents: 1 Front light 1 Rear light