The Proviz Procyon rear bike light is a stylish creative design that packs a punch at night. The sleek metal design ensures a waterproof rating of IPX-4 and the multi-functional design ensures it can be attached to your seat post, rucksack, helmet and more! Multi-functional: Can be attached to seat post, rucksack, helmet etc | Function modes: Full / Low . Flash | Quick release fixing | USB rechargeable (USB lead included) | Battery type: Lithium-ion | Battery Capacity: 80mAh | Voltage: 3.6V | Run time: Up to 4 hours | Size: 45 x 38 x 25mm | Waterproof: resistant to splashing water or rain to IPX-4 rating | LED: CLM2B | Weight:26g | Material: Metal, PS, PMMA