Details: Product Description Optional 4-line cordless station unit for the Panasonic KX-TG4000 system / 8 hour talk time--96 hour standby / Backlit LCD Amazon.com Need more phones? This cordless station (with corded handset) is designed for use with Panasonic's KX-TG2000B or KX-TG4000B phone systems. By utilizing 94 autoscan channels, digital spread spectrum technology, and the 2.4 GHz frequency, the KX-TGA420B provides clearer reception and greater range than older phones operating on a 900 MHz band. A 30 name-and-number caller ID memory lets you easily view a list of incoming calls, while the speed dial feature lets you store and quickly call 16 of the most frequently dialed numbers. Three-way conferencing allows you to connect with two outside calls, while four separate lines allow for multiple users or a high volume of incoming calls. With the intercom feature, you can easily communicate with other users on your system, while the integrated speakerphone and headset compatibility make hands-free communication possible. The Ni-MH battery provides up to eight hours of talk time and up to 96 hours of standby. A one-year limited warranty is also provided.