1Intimate white screen backlight design, even in the dark, you can call freely. 2Excellent voice chip design, voice diffuser technology, reduce noise and enhance the original sound. 3Hands-free, ring volume adjustable. HD hands-free calling allows you to release your hands. 4The sub-machine can be expanded, only one telephone line is needed to solve the needs of the whole family call, and the internal intercom can be free between the sub-machines. 5When the incoming call ringing sounds, you can automatically enter the call by lifting the handle, which is convenient and time-saving. Item Type: Telephone Color: White / Black (Optional)Product Model: W158Hands-Free Calling: SupportWhite Screen Backlight: SupportThree-Way Calling: SupportFree Intercom: SupportAuto Answer: SupportHands-Free, Ringtone Volume Adjustable: SupportExpand Four Sub-Machines: Support18 Ringtones: SupportKeyboard Lock: Support40 Groups of Call Inquiries: SupportApplicable Battery: 2xAAA (Not Included)Installation Steps:Landline: Plug in the power plug and plug in the telephone line;Sub-machine: Slide the battery cover down according to the direction of the arrow on the second page of the manual. After the battery is connected to the battery compartment, the positive and negative poles are placed in the battery compartment, and then placed on the base unit with the power plug inserted.After the installation is complete, pick up your own and press the dial button to hear the dial tone, indicating that the installation was successful. If you are unable to use the handset, please refer to the registration of the handset on page 5 of the manual for normal use. 1 x Host1 x Signal Base1 x Phone Line1 x Power Adapter