easy radio modules

has anyone had any experience of the 868 MHz easy radio transmitters?

How well do they work in buildings?

Using 868MHz, the wall penetration is better compares to 2.4GHz systems, but less reflections, which sometimes can help in-building communications.

this range is not so good , but it depend inside of which kind of bilding u will use it for example for 2.4GHZ wave long as = 12.5 sm that mean if between details of metallic scelet of bilding have more them 13 sm u can use it , if not try use more longer wave like 27-150 MHZ or maybe 433 . for 433 i tested Aurel TX RX analog radio modules inside of bilding i have about 30 metr distance . hope it answer ...