Based on this product's specifications, here are some alternatives and similar models
Replacement Shaver Head Adler AD 2940 for AD 2940.1 models
Summary description:
Replacement shaver head compatible with Adler AD 2940.1 (AD 2940) electric shavers. Designed as a spare cutting unit to restore shaving performance, it fits the specified Adler model and replaces worn or damaged blades and foil. Suitable for routine maintenance, improving cut quality and extending the service life of the appliance.