Gel Wheelchair Cushion 16 x 16 x 2 Instant Hot Packs 10 MHz Superficial * Transducers MSHQ 1594XL 10 MHz Superficial * Transducers for fetal dopplers * Most popular size for vascular treatment * For vascular use (the lower the transducer number the deeper it will read) * For use with Huntleigh Models FD2 MD2 SD2 and D900 * Visual Signaling Top mounted flashing lights helps to verify that the monitor is armed (slow green flash) and locate the monitor when alarming (fast red flash) perfect for nighttime use 16 (W) X 16 (D) X 2 (H) Gel U Seat Lite General Use 2 Gel Foam Wheelchair Cushion * The cover is fluid resistant low shear nylon