OP-1 is the all-in-one portable synthesizer, sampler and controller. With additional features like a built-in FM radio and an assignable G-force sensor for motion controlled effects, there is quite nothing like it. With ten synthesizer engines, eight high quality effects and multiple routable LFO's, you'll never hit the wall when it comes to creativity or finding the right sound for the job. Add the unique built-in sequencers on top of that and you'll understand why so many highly regarded producers and artists hold this little machine so dear. In controller mode, OP-1 turns in to a full blown MIDI controller, with access to transport (play/stop, rec, rewind and forward), a two octave keyboard with four endless encoders as well as a sound module that can be controlled from virtually any external software. Record anything you create with the 4-track tape feature. When you connect OP-1 to a computer using the included USB cable, the OP-1 shows up as a MIDI controller or a storage device. It has 60 fps super amoled display. Battery life of 1800 mAh USB charged battery is up to 16 hours.