A cordless telephone works via radio like a mobile phone. This can affect your health. In addition to DECT telephony, there are various transmission technologies with different levels of radiation. Wifi and Bluetooth telephony have the lowest radiation.
You can also connect a cordless phone with Bluetooth to other devices such as your smartphone and forward your calls via the cordless landline phone. Digital cordless phones emit radiation for 24 hours. A cordless phone with eco mode reduces the permanent radiation.