Review on WSDCAM Smart Bike Tail Light With Turn Signals And Brake Light, Bike Alarm Horn With Remote, Auto ON/Off Rechargeable Waterproof Bike Horn Alarm Rear Bike Brake Light Turn Signals Bicycle Tail Light by Montrell Copeland

This will not work.1. Cannot be used below rear rack. It is intended only to be mounted in bike seat post. No mounting option to mount rear and below bicycle rack.2. The control is a tiny little button with even smaller buttons which is intended to be detachable from a mount on the handle bar. No, it won't work when you need to activate the horn suddenly. it is a tiny thing with an opening intended I presume to be attached to a key ring. Too tiny, too flimsy, more a toy than a functional attachment to your everyday bike.Will be returning this.