I purchased these for disaster preparedness and have been storing them, but I'm selling them since I haven't needed them. They've only been used for test lighting, but since they've been stored for a long time, please refrain from purchasing if you are concerned about minor details. (EX-837NX) Body size: 55mm diameter x 130mm Weight: 198g Power source: 3 x AA alkaline batteries Continuous lighting: Approximately 30 hours (high mode), 60 hours (low mode), 90 hours (SOS pattern flashing) Warm color LED 1 light used Brightness: Approximately 80 lumens Splash-proof construction (EX-737NX) Warm color LED 1.5W bulb Body size: 55mm diameter x 130mm Weight: 197g Power source: 3 x AA alkaline batteries Practical lighting: Approximately 28 hours at 100%, approximately 56 hours at 50%, flash blinking approximately 84 hours Splash-proof construction