Review on Stay Safe While Cycling With G Keni Smart Bike Tail Light - Auto On/Off, Waterproof, USB Rechargeable, And Ultra Bright LED Warning Back Bicycle Flashlight! by Isaac Samal

I purchased three for three different bikes. after noticing they can't be installed in one of the bikes, I figured i'd install two on the same bike. Since it turns on automatically when it detects movements, i figured both would blink in sync.Not so. All three start in sync, but no two keep the same beat. eventually it looks like they're sequential (and it seems like a turn signal), then random, then back to sync. Not what it was designed for, i guess, and it works rather well as a single light - but don't buy them as side lights since it won't work well.