Compact, aero-post compatible safety light featuring a Daytime Flash mode. Its co-molded construction is super light, yet durable and has an IPX7 waterproof rating. A new Wide Angle Optics lens offers over 270 degrees of visibility. The KTV Pro Smart Rear provides up to 75 lumens (Daytime Flash) and six output/flash modes. It features an integrated USB stick for convenient cable-free recharging, and can run for up to 19.5 hours on a full charge. The KTV Pro Smart rear light connects to Lezyne's phone app where you can control a number of factors, from turning the light on and off, to selecting light modes, viewing current battery levels, and many other features. FEATURES: Max Lumens: 75 Weight: 45g Max Runtime: 19:30 hours (in Femto mode) Recharge Time: 3 hours