Have I bought the headset because it is declared tested on the website of Siemens Gigaset SL 375 for. Works flawlessly! You can let the Gigaset handset lying quietly on the table and move in a 30 square meter space around, the connection is excellent! Only when walls come between them, begins a crack. Only due to the fact that the stone tiles can reverberate a little space, notice the other party that I call on the headset. Even with my phone I've been lucky, switching works flawlessly thanks to multipoint technology. For the price an excellent device!