This mini light has a lightweight aluminum barrel and 1 LED bulb. It comes with 3 inserted LR44 replaceable button batteries with a tab to prevent activation. It includes a carabiner so you can attach to a bag, backpack or purse for quick access. Goes from 2-3/8" when closed to 2-5/8" when opened. Beam Distance: 33M, Lumens 8.1, Drop tested for 1 Meter