Panasonic KX-TGM45S Amplified Expansion HandsetThese expansion handsets offer all of the same great features as the base phone, but require only AC power so they may be placed anywhere in the home. Each expansion comes with a charger base, power cord and handset. Note: Expansion handsets will only work if a Panasonic KX TGM450S base phone is in use Features DECT 6. 0 technology for improved range and superior transmission between base and handset 50dB amplification Tone control 6 level presets