Details and Description:Item: 2016 Novice Bicycle Bike Rear Tail Warning Laser Led Light LampSize: 90*62*26MMColor: Red/Blue/Green Packing: Card packing.Package includes: Bicycle rear tail light * 1 piece.Suitable for : 20 - 31.8mm.Appliance: Night Safety Riding， Cycling.Features:1. Meet the International Safety Standard Class IIIA.2. Super luminous LED light， 6 models flashing.3. Powered by 2 Piece of AAA batteries. (Noted included for shipping safety issures.)4. Firm Adjustable Buckle design.5. Super Power saving. (2 piece of New AAA batteries will work at least )6. It has 2 front led laser lights and 2 side laser lamps. Mark out your personal Lane at night.