A universal desktop NiCad & NiMH battery charger with selectable output voltage and charging current (500mAh - 1000mAh). The maximum size battery pack it can charge is 4000mAh and no more than 12V. The charger is able to detect voltage change and will automatically switch from fast charger to trickle charge when battery has fully charged. The charger has reverse polarity, short circuit and overload protection. Supplied with Tamiya plug, crocodile clip connectors and detachable jack plug