It uses a 1.2GHz 64-bit quad-core Arm Cortex-A53 CPU, has 1GB RAM, integrated 802.11n wireless LAN, and Bluetooth 4.1. ... The Model A/A+ has one USB port, the Model B has two ports, and the Model B+, Raspberry Pi 2 Model B, and Raspberry Pi 3 Model B have four ports. These can be used to connect most USB 2.0 devices.