People might think a shock collar is cruel, but getting shocked a few times to learn I also connected them to each other according to the instructions. How to Use the Transmitter For more information,please visit agptek.com Follow us on Twitter:twitter.com/AGPtek Tablet PC Technical Note: PetSpy has 3 models of Advanced Dog Training Collars: M86-1 (gray), M86N. (black), and M86-2 (for 2 dogs). This manual is designed for all 3 models.E-613/623 Remote Control Training Collar User's Manual. Thank you for choosing our product! Please read this manual carefully before using the product. CAUTION!Please read and follow the instructions in manual. Proper fitting of the collar is important. A collar worn for too long or made too tight on the