The Universal SPEED Receiver is compatible with Classic Elinchrom units and any other flash brand. Delivered with EL - standard sync cable and 3.5 mm jack, to connect to other flash brands. The internal, rechargeable Li-Ion battery provides about 30 hours of battery operation. To maximise battery life, the Auto-Standby function activates when the unit is not used for 4 hours. The charger can be connected to the mains whilst the Universal Receiver is in operation.