Signoscope T1 - The Proven Professional Unit uses a position lever (handle) for fast removing and inserting stamp tray and to adjust pressure. On-off light switch. Contrast adjuster. 7.5 Volt light output. Especially recommended for difficult stamps (US stamps, British Colonies, etc.). Maintenance free. For stamps up to size 2" x 2". Operates on an AC Adapter with 7.5 Volt DC output (included) or 5 "AA" (1.5 Volt) batteries. Size: 8" x 4-1/4" x 5-3/4"H.