Digital Volt and Ampere meter for Mass 24/25-2 DNV, in front panel.Professional users will benefit from a front display with GMDSS alarm functions.GMDSS stands for Global Maritime Distress and Safety System, an internationally agreed-upon set of safety procedures, types of equipment, and communication protocols that is a requirement for the SOLAS (Safety Of Life At Sea) convention and uses DSC and satellite communication.Battery voltage and current are displayed on the digital panel.