We like this dual set. You don’t need a licence, anyone can use them and it has just about all the basic functionality you need. No knobs, just a few buttons and it’s not expensive. Charges via USB C.
Direct from Retivis:
https://www.amazon.co.uk/Retevis-RB639-Handheld-Rechargeable-Emergency-Black/dp/B0D8KSJNP1/ UK Retivis Amazon Shop (not affiliate)