The Cisco CP-3905-PWR-NA is a model of IP phone manufactured by Cisco Systems. It is a basic, entry-level IP phone designed for use in small to medium-sized businesses. The "PWR" in the model name indicates that it is a powered device, meaning it can be powered through an Ethernet connection using Power over Ethernet (PoE) technology. The "NA" indicates that it is designed for use in North America. The CP-3905-PWR-NA features a monochrome display, two programmable line keys, and supports wideband audio for enhanced call quality.