Check the listing for details. Supernova TL3 Mini 6V Seatpost Tail Light - Waterproof, High-Density LED,. Condition: New. Listed at 69.85 USD. The new TL3 Mini Seatpost Clamp: Now this tail light is available stylishly integrated into a seatpost clamp – for maximum visibility and safety in an elegant design. The High Density LED technology ensures extremely high luminous density despite its small size and a widely visible, homogeneous signature with the characteristic SUPERNOVA light ring. A stable and waterproof housing reliably protects the technology. The taillight is available in a 12 V version and, more recently, a 6 V version, ensuring compatibility with dynamos and 6 V e-bike light ports.Diameter: 31.8 mm (for 27.2 mm seat post diameter). Stylishly integrated into a seatpost clamp for maximum visibility and safety with High Density LED technology. Stable and waterproof housing protects the technology, ensuring durability.