Elinchrom Skyport Receiver Plus, faulty, has had some liquid damage and no longer powers on, I haven't had the time to try them in an ultrasonic cleaner so they may still be easily salvageable.

Manufacturer's blurb

The EL-Skyport Receiver Plus, powered with optional 2x AA batteries, is compatible with most flash units offering a sync connection. This device also offers an extra hotshoe connection to trigger speedlites.