Bright and reliable. Convenient compact size. Requires 2 AA batteries (included). Product Characteristics: Sturdy construction and sure-grip design. Reliable switch tested to 100000 cycles. Perfect size for purse, pocket, glove box, drawer and more. For best results, use two Rayovac Maximum Alkaline size AA, 1.5 V batteries. Replace bulb with Rayovac Krypton K4.