This is currently the only tail light we offer since Grin discontinued their rear ElectroLights. Until then, this tail light does the trick just fine.
"Rear 20 Lumen ebike light with wide 6-85V input range. 280 degree visibility. Has DC jack to power directly off your ebike batteries via a Cycle Analyst, Supernova Light or Anderson Tap. Features concave backing and rubber mounting straps for fastening to a seat post or back rack. Cable length 23cm. No on/off switch or blink mode, just steady red when power is present.
Actual Weight (kg)0.0690Light SourceRed Cree XBDLumens Output20Minimum Input Voltage (V)6Max Input Voltage (V)90Peak Input Power (Watts)5.5Connector / JackDC 5.5x2.1mm
Roxim Rear Light Specifications (409.78 kB)"
^ Above information is provided by the distributor: Grin Technologies.