Question about Gigaset AS690HX

The Gigaset AS690HX can be used with various DECT bases, including the Gigaset AS690 Duo base. Here are the relevant details:

- The Gigaset AS690HX is compatible with DECT bases from Gigaset and can also be used with bases from other manufacturers that support DECT/GAP or CAT-iq 2.0.
- The AS690HX handsets can be connected to and used with an existing Gigaset base, which makes it possible to use them as additional handsets for an existing system such as the Gigaset AS690 Duo.

This means that the Gigaset AS690HX can be used as a third handset for a Gigaset AS690 Duo.