Rear light Lezyne KTV PRO SMART REAR features Smart Connect function that allows you to control the output modes through the Lezyne LED Ally smartphone application and also connect to the compatible front light Lezyne LED. Its shaped construction is super lightweight yet durable and has IPX7 water proof rating. The wide lens offers up to 270° visibility. The rear KTV Drive Pro provides up to 75 lumens and 5 output modes. The charging is done through micro-USB cable. Its battery life is up to 19.5 hours.