Adventure Lights Beacon VIP Signal Light 2 Blue 3 Infrared LED's Case and Lens material: Impact resistant with a brass threaded battery compartment Size: 2.75" high (7cm) x 2" wide (5cm) x 1.25" thick (3.2cm) with stainless steel attachment clip Battery life: Steady-On: 8 - 50 hours flashing: 20 - 400 (10 year shelf life) Visibility: Over 3 miles (5 km) over land and over 6 miles air Weight: 3.9 ounces. with battery (110 grams)