Determine battery condition at the touch of a button. Easy accessory hook-up with the external terminals. No more hassles opening a standard box to get at terminals. Accessory socket allows use of common accessories. Charge directly from the external terminals. Ideal for small boats with no DC system. Will accept most group 24 and group 27 size batteries. Deluxe Power Station features vinyl coated steel wing nuts, built in 10 amp circuit breaker and color display box. Standard Power Station features nylon wing nuts, fuse with holder and no display box. No need to open the battery box until the battery needs to be replaced.