Cm18045 Four-line Business System Extension Handset For Use With Vtech Cm18445More efficiently manage phone traffic with this accessory handset for the CM18445 Four Line Business System. Dial and receive calls on up to four different phone lines. DECT 6. 0 digital technology delivers superior quality technology, which provides strong protection against wiretapping and the best, interference free call range. To install, simply connect the power cord and push the registration button. Package Includes: (1) Handset; (1) Charging