Yes, certain product comes with few components to make a complete working set. Please register all the component models individually. Illustrated by below example;
AV Set MCR-840 (as stated on your purchase invoice or Delivery Note but is not tagged with any Serial Number) consists of DVD-840, R-840 and NS-BP300 to make a complete working set.
e-Warranty registration is needed for DVD-840, R-840 and NS-BP300 respectively.