Pull Ups® Learning Designs® for Boys Training Pants, 4T to 5T, 1 Pack of 17 Knee Requires unscrewing of the nuts Hearing Aid Requires unscrewing of the nuts and raising of the seat slightly to slide in the bracket 4 Channel Electrotherapy * Easy to add modularity allows the addition of two additional channels of electrotherapy light therapy or a battery module * High contrast 5 (13 cm) FSTN LCD monochromatic user interface * Two independent electrotherapy channels expandable to four independent channels * Multiple waveform electrotherapy six clinical waveforms: Interferential Premodulated High Volt Russian Symmetrical Biphasic and Microcurrent * Documentation of treatment data with Patient Data Cards * User defined protocols for your specific needs * Dual frequency ultrasound at 1 or 3 Pattern that fades when wet to help your child learn to stay dry They're stretchy to help kids learn how to put them on and take them off like a big kid