The Cisco Unified IP Phone 8961 Power Injector (CP-PWR-CUBE-4) is a power supply device specifically designed for the Cisco Unified IP Phone 8961. It enables the phone to be powered through an Ethernet connection, eliminating the need for a separate power cord or adapter. The power injector is compact in size and can be easily connected to the phone using the provided cables. It features a high-quality build that ensures durability and reliable performance. The power injector is a convenient solution for users who want to simplify their setup and reduce cable clutter. With the Cisco Unified IP Phone 8961 Power Injector, you can power your phone efficiently and effectively.