New Seiko guitar/bass tuner. Capable of tuning up to a 7 string guitar or 6 string bass. Use 1/4 Input and output 1/4 jack or built in microphone. Has a tone generator to generate the pitch of guitar or bass string that you want to tune. Capable of tuning as much as 5 semitones down (flat) and 7 semitones up (sharp) . Runs on 2 AAA batteries.