Lezyne KTV Drive Headlight and KTV Pro Smart Taillight Set: Black. The Lezyne KTV Drive Headlight and KTV Pro Smart Taillight Set features Smart Connect allowing the headlight to control the taillight.  Both lights can connect to and be controlled by a compatible Lezyne GPS computer.
Smart Connect technology 
Highly disruptive Daytime Flash mode
Front  - Max 200 lumens up to 20 hour runtime depending on mode
 Rear   - Max 75 lumens up to 19.5 hour runtime depending on mode