31x series dogs are considered to look like a bichon puppy or a bear cub. ERS 31xB These models are aesthetically identical to the ERS-311 and ERS-312 and feature Bluetooth connection to a handheld viewer (Japan only) which would "translate Aibos thoughts and feelings into text" and enable the handler to play games with them. Third generation models (7Mx) The ERS-7 and its successive iterations were the third generation of AIBO robots and the final ones released before the product line's 2006 discontinuation. They were first sold in 2003 and priced between $1500 and $2000. It has been estimated that ERS-7 sold 15,000 units of each variant, M1 to M3, for a total of 45,000 units. Fourth generation models ERS-1000 The ERS-1000 was the first AIBO model in the product line's revival, released in January 2018. It is equipped with an LTE SIM card to support interaction and learning via cloud computing, requiring a persistent Internet connection to function fully. This model has a less-robotic and "cuter" appearance than other models. The ERS-1000 can recognize up to 100 faces, responds to over 50 voice commands, and can learn a customizable trick. It sold for about $3,000. QRIO The humanoid QRIO robot was designed as the successor to AIBO and runs the same base R-CODE and Aperios operating system. Its development was halted prior to commercial release. Hardware The initial ERS-110 AIBO's hardware includes a 64-bit RISC processor, 16 megabytes of RAM, sensors (touch, camera, range-finder, microphone, acceleration, angular velocity), a speaker, and actuators (legs, neck, mouth, tail). As the series developed, more sensors and actuators were added. During the latter half of the second aibo model, 20x, a revision model named super core was added which fixed a flaw in the robots' head clutch which caused tilting, panning, and drooping issues, also known as PAS, TAS, and DHS. These revision models also included a much faster processor, hence the name supercore. Wi-Fi was available as an add-on for some second-generation AIBOs. The third family of AIBOs, the ERS-7s, have multiple head and body sensors, clicking ear actuators, a chest-mounted proximity sensor, expressive "Illume-Face" and Wi-Fi connectivity. All AIBOs were bundled with accessories including a charging station and pink ball toy. Late-model ERS7's were bundled with a pink AIBone bone-shaped toy (as did the AIBO ERS-1000 models), playing cards, and a charging station with a pole and marker mat for autonomous