A remote-controlled turn signal unit for a vehicle or trailer is provided. In one embodiment, an LED array and digital transceiver are embedded into a traditional bulb housing. This bulb can then be placed into existing tail or other light sockets on the exterior of a vehicle and can serve as turn signals being actuated by radio. This bulb can also be part of a self-contained magnetic housing that can be attached temporarily to the vehicle. This self-contained unit contains miniature digital radio, rechargeable battery, and LED light assembly, but does not rely upon or required modification of the vehicle's electrical system.