Based on this product's specifications, here are some alternatives and similar models
HYPERICE Heated Head Attachment for Hypervolt (model 40021-001-00) — heated massage head for scalp and head muscles
Summary description:
Heated Head Attachment for the HYPERICE Hypervolt (model 40021-001-00) is a replacement heated massage head designed for compatible Hypervolt percussive devices. It supplies gentle, controlled heat at the contact point to increase comfort during scalp and head muscle massage. Suitable for at-home routines, pre- or post-activity recovery and targeted tension relief, it improves relaxation and user comfort.