1. Material: aluminum alloy + plastic 2. Size: 24x14.5mm 3. Mode: Steady and flashing 4. Battery: 1xCR927 5. Features: waterproof, ultra-sealed, ip67 waterproof grade, 30 minutes immersion test. The safety clip can easily be clamped anywhere you need a little light! 6. Battery runtime: 60 hours of light 7. Multi-function: can be used as label light, shoe clip light, hat warning light, belt light, cuff light, decorative light, sleeping night light, backpack warning light 8. Note: turn clockwise to turn on the light mode, turn counterclockwise to turn off the light, and finally turn on the battery

http://olla.gr/shoe-clip-light-led-mini-clip-light-outdoor-night-running-warning-light-green/