Linear PS124D-UP4 12/24 VDC 4-Output Upgrade Add-On BoardCondition: * New stock, in OEM packaging. Open box. As pictured.Additional Notes:* Upgrade a Linear Power Supply (PS124 Series) or E3 Integrated System from 4 to 8 outputs.* 12 & 24 Volt DC Power selectable by output.* 4 PTC Fused Outputs for Lock/Aux (12 or 24VDC)* 2 Additional AUX Outputs (12VDC)* Battery Charging Circuit* Fire Drop Input* Conforms to UL Std. 294LinearPS124D-UP4