The Ranger Quadra AS is a compact portable 400 Ws battery flash system for studio and outdoor use. A perfect battery flash system for anybody who like un-plugged (not connected to the mains) photography. The RQ System offers "Action Freezing" flash duration with fast flash recycling time and also unplugged (wireless) trigger and remote options.This Quadra pack and battery and does not include a flashhead.Features:EL-Skyport (inside) - Radio remote control of power settings and flash triggerTwo outlets – Asymmetric 2 : 1 ratioSingle high power channelSingle super fast flash channelIntelligent Battery Power OptimisationAuto Power-OffProgrammable Pilot Light durationSuper efficient LED Pilot LightIntelligent Slave CellRed eye pre-flash auto-detectProgrammable and pre-set effect modesCompatible with Ranger Quadra Heads