Main principle Superheterodyne (common); ZF/IF 455 kHz Wave bands Broadcast plus more than 2 Short Wave bands. Power type and voltage Dry Batteries / D: 6 x 1.5 & D: 1 x 1.5 for light Volt Loudspeaker 2 Loudspeakers Power out 0.5 W (0.8 W max.) Material Plastics (no bakelite or catalin) Model: National All Transistor All Wave 4-Band 9-Transistor T-100 - Panasonic, Matsushita, Shape Portable set > 8 inch (also usable without mains) Dimensions (WHD) 13.5 x 10.75 x 4.875 inch / 343 x 273 x 124 mm National Model T-100 is a nine transistor, two diode, four-band AM receiver. Magic-meter for precise tuning, two-way sound with 5" and 3½" PM dynamic speakers, separate bass and treble controls, fine tuning control, magnetic antenna (internal) and a stand type frame antenna for shortwave reception, internal Magnetic antenna and a stand type frame antenna for shortwave reception, socket for connection of record player and external speaker box, dial light for tuning in the dark, dedicated 1.5V battery for dial lights. Frequency ranges: SW3: 12 - 26.1 MHz SW2: 4.6 - 12 MHz SW1: 1.6 - 4.6 MHz MW: 535 - 1605 kHz In good working condition. Batteries included.