Yealink EXP50 For Yealink T5 series IP phones (272 x 480)Color screen20 physical keys3 control keys for fast switching pages Yealink T53 3.7″ (360 x 160) Black and white screen21 memory keys Yealink T53W 3.7″ (360 x 160) Black and white screen21 memory keys Yealink T54W 4.3″ (480 x 272) Color screen27 memory keys Yealink T57W 7″ (800 x 480)Color screen29 touch keys Yealink T58A 7″ (1024 x 600)Color capacitive touch screen27 memory keys Yealink T58V 7″ (1024 x 600)Color capacitive touch screen27 memory keys