The X-15 is an easy-to-use cassette tape four-track 4 channel multi-tracker with that great Fostex sound. It is a portable, battery/mains operated four track cassette recorder and mixer — with the emphasis definitely on 'portable': for the complete unit measures only 3"(H) x 11½"(W) x 9"(D) and weighs in at under 6½lbs including the battery pack! Tape speed — which is the standard 1⅞-ips; no double speed facility being provided. The slower tape speed should normally result in a lower signal to noise ratio, but the inclusion of built in Dolby B type noise reduction circuitry helps to maintain a healthy S/N of 60dB which is still slightly better than most open reel budget multitrack tape recorders! Crosstalk is quoted as 40dB, with a signal frequency response that extends up to 12.5kHz. Record 2 tracks simultaneously! The recorder requires a voltage of between 11 and 15 volts. A DC In socket on the rear panel allows an AC adaptor to be connected for mains power. No battery included Including power adapter 12 used cassette tapes with recording ability in a box. Fully cleaned, new belts, idler, heads cleaned and demagnetized. Picture are description Model: Fostex X-15 - Foster Electric Co. Ltd. Shape Portable set > 8 inches (also usable without mains power) Dimensions (WHD) 290 x 75 x 195 mm / 11.4 x 3 x 7.7 inches Notes Fostex X-15 Multitracker, 4-track cassette recorder, pitch control +/- 15%, mixer, Dolby B noise reduction system; operates via external power supply or screw-on battery box (total weight then 2.9 kg). 2 head single compact cassette deck - 4-track - 4-channel - tape speed: 4.76 cm/s - heads: 1 x 4T record/playback, 1 x 4T erase - tape type: CrO2 - - frequency response: 40Hz to 12,500 Hz (Cr02 tape) - signal to noise ratio: 60dB (dolby B) - wow and flutter: 0.1% - total harmonic distortion: 1.5%. Made in Japan. Net weight (2.2 lb = 1 kg) 2.1kg / 4lb 10oz (4,626lb)