1、2.4GHZ Communication Technology: 2.4GHZ digital communication technology is adopted to make signal transmission more stable and sound transmission clearer. 2、Incoming Outgoing Inquiry: Phone systems for home use host and sub machine each have 40 groups of incoming calls and 10 groups of outgoing inquiries. Hands free calling, free your hands and chat freely. 3、Screen Blue Backlight: Screen backlight design allows you to easily make calls even in the dark. The host has a set of family numbers, important contacts can be stored, and can be directly reached with one click. 4、Sub Machine Expandable: Business phone system host can be expanded to 4 sub machines and a telephone line to meet the needs of family calls and support three way calls. 5、Eco Friendly Material: The phone body is made of environmentally friendly ABS material, large particle keys, using silk screen technology, the numbers are clearer, tested by industrial alcohol, will not fade. Item Type: Office Phone System Material: ABS Model: W128 Colour: Black Function: Long Distance Communication Scope of Application: Home, Office Application Technology: 2.4GHZ Digital Communication Technology Phonebook Function: Support Ringtone Types: 18 Ringtones Ringtone Volume Adjustment: 5 Stops and Off 3 Way Calling: Support Intercom: Support Incoming Call System: Compatible with FSK DTMF Family Number: A Host Group Hands Ree Calling: Support Caller Storage: 40 Groups of Main and Sub Machines Outgoing Power Storage: 10 Sets of Main and Sub Machines Mute Function: Host Support Power Outage Use: Host Support Built in Supporting Battery: 2 x AAA Rechargeable Battery Battery Capacity: 2 x 600mAh (included) 1 x Telephone Host 1 x Telephone Sub Machine 1 x Handset 1 x Telephone Line 1 x Sub Machine Base 1 x Handset Cable 2 x Matching Battery 2 x Power Adapter