The Mini LED keychain is super bright to meet your daily use. It has a durable aluminium body and 6 assorted colors for you choice, blue, red, silver, black, gray, green. The new energy-saving light source life of up to 100,000 hours, suitable for self safety, cycling, caving, climbing, camping, biking, exploring and outdoors activities, Built-in three LR44 button batteries, shell aviation magnesiumalloy material, high strength, low weight, surface oxidation treatment through a special, more wearable, feel more comfortable. When you use it at first time, open the battery cover, put the battery at the bottom of the white insulation sheet before they can be used.