CLARITY C4220/C4220HSW/ EXPANDBLE HANDSET W/ EXPANDBLE HANDSET Bright visual ringers in handset and base flash to signal incoming calls Concave earpiece creates an acoustic chamber to provide crystal clear sound DCP and 50 decibels of intelligent amplification make calls louder, clearer and easier to understand Four (4) tone settings provide a customized listening experience High contrast white LED screen is bright and easy to read