EL-Skyport Transmitter Plus N° 19368
The EL-Skyport Transmitter Plus is compatible with most cameras offering a hotshoe connection.
This device can control flash power from the Transmitter for EL-Skyport enabled flash units and offers a swivel function for optimized reception and powered with optional 2x AA batteries. 
Includes: one 2.5 mm to PC sync cord and one wrist strap
•Trigger reliably and adjust flash power up to 200 m (656 feet) away
•Optimized reception with rotating swivel function
•4 Groups and ALL selection
•16 different channels available (8 in normal mode and 8 in speed mode)
•Quick increase or decrease of the flash power per group
•Runs on AA batteries
•Metal hotshoe connector with screw lock
•2.5 mm sync socket
•Normal and Speed sync mode (for leaf shutter cameras) More info here
•All functionalities can be easily adjusted
•Durable with robust mechanics 
•Ergonomic Swiss design