Perfect for city commuting and evening road ridesthe all-new Cast tail lights are compact bright and durable USB rechargeable LED tail lights that come at a price that won’t break the bank. Features 1 LED delivers 50 candela of intensity 2 steady beam modes and 3 flash modes for variable use and run time Power and recharge indicator light displays current power or recharge status Green100~30%; Red 30~0% IPX4 water resistant Micro-USB charging port with micro-USB cable included Rubber O-ring and different shapes of mounting shims for tool-free installation on most seat posts Integrated mounting clip for backpacks and bags ANSI Certified Specifications Dimension/Size 30*30*25mm Weight 20g/each LED 1LED Material Engineer grade plastic Waterproof Rating IPX4 Mode/Lumen/Run Time HL10 High Steady 10LM for 2 hrs Low Steady 5LM for 5 hrs High Flash 10LM for 4 hrs Low Flash 5LM for 14 hrs Eco Flash 5LM for 20 hrs Mode/Lumen/Run Time TL10 High Steady 10LM for 2 hrs Low Steady 5LM for 4 hrs High Flash 10LM for 6 hrs Low Flash 5LM for 8 hrs Eco Flash 5LM for 20 hrs Battery 220mAh Lithium Ion Charge/Charge Time Micro USB / 2~4 hr Battery Indicator 100~30% - Green 30~0% - Red Mount Rubber O-ring Mounting Clip