bear shock® is the first ultra lightweight battery-powered, electric fence system and is designed to provide safety and sound sleep while in bear country and to help protect you and your equipment from curious bears by providing a surprising electrical shock if touched. if you are in the market for a great mountain bike to use, this is the one for you! she's very nice and very professional. this is such an important thing for you to understand. we worked on three positions, ground, above knee and power. 