Utilising COB (chip-on-board) technology the Slimline F100 is a great choice for visibility to other road users.Key Features• Max Output 100Lm• Runtime 2-45hrs• COB LED • Low battery indicator• Waterproof IPX4• Silicone straps and micro-USB cable included• USB rechargeable 3.7v 500mAh Li-Pol battery• Size (approx): 25mm x 25mm x 70mmModes & RuntimeHigh Constant: 2hrsMedium Constant: 4hrsLow Constant: 6hrsEco Constant: 12hrSlow Flash Low Beam: 45hrsSlow Flash Med Beam: 9hrSlow Flash High Beam 5hrQuick Flash Med Beam: 18hr""