The KX-TS402SX corded telephone model boasts several key features: 1. **Incoming/Outgoing Memory**: It likely has a memory feature that stores incoming and outgoing call records, allowing users to keep track of calls made and received. 2. **Keypad Lock with Password Facility**: This feature enables users to lock the keypad to prevent accidental dialing or unauthorized use. The password facility adds an extra layer of security to access the phone's functions. 3. **Tone and Pulse Dialing**: The phone supports both tone and pulse dialing methods, catering to different types of phone systems or preferences. 4. **Mute Function**: This function allows users to mute their microphone during a call, useful for situations where background noise needs to be eliminated temporarily. 5. **Flash Button**: The flash button is commonly used in conjunction with call waiting or to access certain telephone services provided by the telephone service provider. 6. **Redial Rewrite List**: This feature likely allows users to view and edit the list of recently dialed numbers for easy redialing. These features make the KX-TS402SX a versatile and user-friendly corded telephone option.