The DAVID PAL36 with CES (Cranio-Electro Stimulation) is just that - its our PAL36 but also has CES built in. It has the benefits of AVE and CES all in one machine! It is the same size as the DAVID PAL (approximate dimensions - 2.5 x 1 x 3.5 inches / 7 x 2.5 x 9cm ) which is perfect for people who are on the go. The PAL36 with CES offers the same features as the DAVID PAL, but with 30 preset sessions and 6 spaces to store your own user defined sessions, and CES.  The CES electrode cable, that is included, is an ear clip.