Based on this product's specifications, here are some alternatives and similar models
Snom Clip accessory for M70/M80 headsets model 4521 — headset clip mounting accessory
Summary description:
Replacement clip accessory for Snom M70 and M80 wireless headsets, model 4521. Designed to attach the headset securely to clothing or belt for convenient carrying and quick access. Compatible with M70/M80 series, it restores or adds a mounting option for daily use in office and mobile environments, helping keep the headset accessible and protected when not worn.