This 40X mixer I'm selling is quite rare as it supports both 48V and AB12V phantom power. Recent 40X models only support 48V. Many people are looking for mixers that support both phantom power options. Each input and output has been checked. No crackling. The meters are cloudy and cracked, but the main unit is in very good condition, I think. Maintenance was done in 2015. The battery is NP1. (I haven't confirmed this with an NP1 battery.) Confirmed with an external power supply. No warranty, no returns. I am not a technician from the manufacturer, so please refrain from purchasing if you are concerned about minor details. This is a used item, so please purchase only if you understand the current condition. No claims, no returns. #fieldmixer #PROTECH #PROTECH4CHfieldmixer #FS-40X #phantompower