The Nebula lights offer versatility by mounting either horizontally or vertically with up to 400 lumens output in day light flashing mode, water resistance and low battery indicator. Features: Rechargeable lithium polymer battery Mode memory function Auto safe mode Quick release universal bracket (fits all round and AERO style bars) Low battery, charging and fully charged indicator Automatic fully charged cut-off system Water resistance (IPX 4) Recharge time: 2.5hrs Front light Up to 400 lumens Rear light Up to 200 lumens