DECT 6.0 Interference Free Cordless Frequency - (1.9 GHz Digital Enhanced Cordless Telecommunications). Maximum Voice Security. Clearest Voice Reception.Digital Answering System with Handset Access. Three Extra Handsets and Chargers Included. Plus DWX207 Submersible Waterproof Accessory Handset - JIS7 Compliant, Impact and Dust Resistance. Base Dual Keypad/Speakerphone. High Visibility Message Waiting Indicator.