The Circle Pad Pro is a new accessory for Nintendo 3DS, designed to increase the way the player enjoys Nintendo 3DS software. It consists of a shell that the Nintendo 3DS slots into with an additional Circle Pad on the right-hand side (termed "Right Circle Pad" or "Circle Pad (R)") and three shoulder buttons; these are R Button and the new ZR and ZL Buttons.
The player uses his Circle Pad Pro by slotting his Nintendo 3DS console into the accessory; the console will then recognise the accessory via infrared transceiver.
The new accessory allows some Nintendo 3DS software titles to be played more efficiently and comfortably by the use of the new Right Circle Pad (for example, games that are "twin-stick shooters"), as well as offering new features via the new shoulder buttons (depending on software). It is powered by one AAA Battery.