P/N: 877825-B21; 874432-001; MZPLL1T6HEHP; MZ-PLL1T60. The pictures provided are taken in-house, however they may not be of the exact unit. If you would like clarification based on the pictures, please feel free to ask. Failure to do so may jeopardize the successful return of your item. After contacting us, we may ask you to run some basic tests while communicating with one of our technicians. If the item is still defective after testing, you will receive further instructions.