Pair this phone with a Bluetooth induction receiver or Bluetooth hearing aid interface device and receive calls directly through your hearing aids for loud, clear sound. Pair it with your Bluetooth cell phone and you can answer your cell phone calls from the landline phone. Expandable cordless system (up to 12 total handsets) with a digital answering machine and speakerphone on the handset and in the base. Up to 8 Bluetooth cells phones can be paired to make and receive cell phone calls. Conference cell phone and landline calls. Bluetooth receivers operate within 33 feet of the base telephone. Any handset can answer a cell phone call. Adjustable ringer volume. Large, full color handset display. One year warranty.