Opening time dark to light (delay): 60-400 ms classifications optiques. Exemple (EN 379) : Battery type: 2 x CR2032 Battery life: 2000 hours 3 / 8-12 3M 1 /1 / 1 / 2 / EN379 CE Operating temperature: -5°C to +55°C Teinte claire Head sizes: 50-64 cm Teinte(s) foncée(s)