Seimens Gigaset A400 Telephone Seimens Gigaset A400 Telephone $329.00 Made with quality materials, the Gigaset A400 has a solid look and feel. Its ergonomic design ensures comfortable usage, and its large high-quality keys feature sensitive pressure points for easy dialling. Enjoy the freedom of hands-free talking with the Gigaset A400 and brilliant sound quality with every conversation. Radiation-free ECO Mode Plus1 means that the Gigaset A400 turns off the transmitting power when the phone is in standby.