HP 8121-0895 power cord is a black mains cable for European use, identified as Option 954. It provides a direct connection between a compatible mains plug and a device with a C7 power inlet.
The cord measures 0.5 m and has two 17 AWG conductors. One end is a male plug; the other is a straight female C7 coupler. Its compact length suits setups where the power source and equipment are close together.
The listed compatible device is the HP Officejet 6700 Premium e-AiO. This cord is intended for connecting that printer to mains power.