Panasonic KX-TS400 telephone set featuring wall-mountable, Single line operation corded landline phone with 6-step electronic handset volume control, call waiting compatible optional and requires no batteries to operate, ringing tone selector off / low / high, 1 redial number memory, electronic volume control, 4 steps electronic volume control, 600 ms timed flash, 150 x 200 x 96 mm dimension.