1. Light source uses CREE LEDs with high efficiency & long lifetime 2. Aviation grade aluminum alloy Anodic oxidation casing, shock & impact resistant. 3. Battery with protection against over charge, over discharge and short circuit. 4. Long distance signal indication as far as 5km, extra long working hours reaching to 24H 5. Waterproof IP66, corrosion proof WF2. 6. Color of lamp source is optional: red/white/yellow and red/white/green