Rhythm Watch RW200. TAMA's Rhythm Watch has everything a drummer needs to make sure they stay on tempo-live and in the studio. Like the original Rhythm Watch, the RW200 features plenty of volume to use while playing real drums, a dial for quick tempo adjustments, separate volumes for quarter notes, eighths and triplets, but now features a large, easy to read backlit display, a more durable housing and keypad, and even more memory for pattern storage.