AT T SynJ SB67138 / SB67118 Brand New Includes 2 Year Warranty The AT T SB67138 four-line corded base and cordless system offers expandability up to 10 handsets and features DECT 6.0 Zero Blind Slot Digital technology. This technology strengthens the radio signal in areas that normally have a weak signal to the base unit. Each extension handset provides individual voicemail , line status, and message waiting indication. Mobile employees have easy access to push to talk, paging, call transfer and 3-way conferencing, You can choose between standard speakerphone or headset operation. The SB67138 speakerphone base supports 4 lines with 100 name and number phonebook directory, power failure protection and automated attendant. The SB67118 can also support up to 6 AT T booster antennas / repeaters sold separately . The repeaters extend the range between handset and base by 900 meters. SynJ™ Extendable Range Phone Systems SMB employees work in a variety of places, from small offices to the largest warehouses. The SynJ™ extendable range phone system provides cordless handset extensions, Push-to-Talk functionality, up to a half mile of extended range and mobile page and conferencing. SB67138 Features 4-Line Operation Caller ID / Call Waiting Expandable Up To 10 Handsets Dual Speakerphone Base Handset Large Backlit LCD Display Lighted Keypad 10 Station Speed Dial 50 Station Name / Number Caller ID Memory 100 Station Phone Directory / Dialer Handset to Base / Handset Intercom 3-Way Conferencing Last 10 Number Redial Selectable Ringtones Handset / Ringer Volume Control Speakerphone Volume Control Bilingual Menu Support English / Spanish Page Chain Dial Line In Use Indicator 2.5mm Headset Jack Call Transfer New DECT 6.0 Technology Interference Free Communication Increased Clarity / Enhanced Security Wider Range / Network Friendly 1.9GHz Corded / Cordless Phone Combo Dedicated for Cordless Phones by the FCC 30% Battery Life Increase Over 5.8GHz New Call Indicator Music On Hold Compatible Mute 100 Minute Digital Answering System Voice Menu Time and Day Stamp Call Screening / Intercept Remote Access Memo Recording Handset Message Access Automated Attendant Hold Voicemail Waiting Indicator