Requested replacement batteries, everthing ok :)
How, when, and where to use the Z-Vibe|||Written by Debra C. Lowsky, MS, CCC-SLP, the speech-language pathologist behind all of ARK's products, this book is an extensive reference guide explaining how, when, and where to use the Z-Vibe® (formerly called the DnZ-Vibe®), Z-Grabber®, and all of their most popular tip attachments. It is a 60-page, easy-to-carry, spiral-bound book with many detailed illustrations showing the placement of the tools. With a spiral binding, you can easily refer to the book during therapy exercises - no "fighting" with the pages! Topics cover how to use ARK's oral motor tools to improve oral awareness, lip movement, jaw grading and stability, tongue and jaw dissociation, tongue elevation, tongue lateralization, tongue bowl, feeding, biting and chewing, oral hygiene, and more. Book measures a compact 5.5" wide x 8.5" tall.