Securely attach your phone to Handlebars with theJoby GripTight Bike Mount PRO Phone Holder + Front and Rear LED lights. Over-molded, stainless steel plates secure your phone to handlebars from 22.5mm to 35mm diameter. With this superior design concept a variety of phone positions can be acheived including portrait or landscape mode. The perfect accessory for bicycles, scooters or fitness bikes just about anything with a handle bar. The Front and Rear LED lights have srtraps to secure them to the saddle mount and handlebar and are powered by two CR2032 3V batteries.