Tascam Tascam Guitar Trainer and Portable CD Player, 1/2 Speed Playback without Changing Pitch, Built-in FX, Built-in Tuner Frequency characteristics: 20 ~ 20,000Hz (+ 0.5 / -5dB) / SN ratio: 85dB / Dynamic Range: 90dB / harmonic distortion rate: 0.05% or less (200Hz-20kHz) / Channel separation: 80dB / audio input and output rating: (GUITAR / MIC IN pin) connector: 6.3 mono phone jack / (LINE OUT pin) connector: 3.5 stereo mini-jack / (pHONES pin) connector: 3.5 stereo mini-jack Power supply: AA battery  4 or DC 5V (optional AC adapter PS-P520 is required) / battery duration: nickel-metal hydride: 6.5 hours, alkaline battery: 5 hours / power consumption: 2.5W (when the AC adapter is used) Dimensions: 194 (width)  39 (height)  138 (depth) mm / mass: 550g (without batteries) Accessories: Japanese manual, Japanese troubleshooting Japanese manual URL (PDF):http://tascam.jp/content/downloads/products/22/cd-gt2_om_va_j.pdf