I purchased the Siemens base staton and 4 handset units. Within 3 months, two of the handsets were unusable (battery stopped charging and the other unit had too much static). The ones that are still usable are lously at best. Scratchy sound, and voices fade in and out. The bright side to this sad report is that the base station is great! It is easy to configure and works very well in all aspects. Do not buy this system if you intend to expand it by using additional handsets!