The DynaTAC 8 Series, Classic, Classic II, Ultra Classic, and Ultra Classic II had an LED display, with red LEDs; the DynaTAC International Series with green LEDs, and the DynaTAC 6000XL used a vacuum fluorescent display. These displays were severely limited in what information they could show. The battery allowed for a call of up to 60 minutes, after which it was necessary to charge the phone up to 10 hours in a trickle charger or one hour in a fast charger, which was a separate accessory. While still retaining the DynaTAC name, the 6000XL was completely unrelated to the DynaTAC 8000 Series, in that it was a transportable phone meant for installation in a vehicle.