Review on CarryBright Bike Turn Signal Lights: Waterproof, Remote Controlled Front and Rear Warning Light for Cycling Safety by Timothy Louis

Easy to install and use. The strap that holds the controller to the steering wheel is not tight enough and slips easily. It's very bright at night and not very bright during the day. You'll still be visible during the day if you're close enough, but if someone is looking at the sun in front or behind you, they probably won't see the signal. Battery life in Signals is terrible. If they're fully charged and haven't been used for less than a week, they're dead and need to be charged again. I would estimate the cost to be around $30-$50 but definitely not worth $100.