The KTV Drive Pro Smart Pair (by Lezyne) is an advanced pair of cycling lights for riders looking for greatly improved visibility. The pair comes equipped with Smart Connect wireless technology, which allows them to be quickly programmed and customized by the companion LED Ally phone app. Once programmed and paired, the front light wirelessly controls the rear light, allowing for one-button turn-on and shut-off as well as mode control of both lights simultaneously. Customize your setup with only the modes you need, with support for up to four mode-sets to serve a variety of applications. FRONT: The front light is super compact and lightweight and features a super bright 200-lumen Daytime Flash mode. Its co-molded construction is super durable and has an IPX7 waterproof rating. With a cable-free USB recharging stick, it can run for up to 20 hours on a full charge. And the 2-in-1 patented clip/strap system attaches to a variety of bars and loops. REAR: Powerful and versatile cycling taillight with a highly visible 75-lumen Daytime Flash mode. Its construction features a light and durable co-molded design that's IPX7 (waterproof) rated. It has six output modes and features Lezyne Wide Angle Optics for up to 270° of visibility. The KTV Smart 75 is compatible with round or aero posts, and it has an integrated cable-free recharging USB stick. Specs Output/Runtime (Front): Max 200 lumens / 20 hour runtime / 2:15 hour recharge time Output/Runtime (Rear): Max 75 lumens / 19 hour runtime / 2:15 hour recharge time Integrated USB stick for cable-free recharging. IPX7 waterproof, co-molded body