This is a BOSS DR-670 rhythm machine (body only, no box) and manual. How about it? Operation has been confirmed with both batteries and AC power (neither included). Instant purchase is welcome. Please understand that this is a used item and no returns or refunds will be accepted. It runs on six AA batteries or a standard BOSS effects pedal AC adapter (center negative, DC9V). The following is extracted from the manufacturer's page: ＜Drums＞ ⚫︎ Built-in waveforms from the acclaimed DR-770. 256 sound variations ⚫︎ 200 preset rhythm patterns and 200 user patterns can be saved. ＜Bass＞ ⚫︎ Built-in 16 bass sounds such as slap, pick, and wood bass. ＜Other＞ ⚫︎ 20 pads on the panel are arranged like bass strings/frets. Convenient for bass part input. ⚫︎ Each pad has an independent dynamics sensor. Changes can be made depending on how hard you hit the pad. ⚫︎ Equipped with a direct pattern play function. Assign your favorite patterns to the 16 key pads and switch patterns by pressing them. ⚫︎ Fill-in function that allows you to insert fills in your favorite places. Also equipped with a tap tempo function that can be set by tapping the pads. #BOSS #RhythmBox #Roland #Roland #RhythmMachine