The Sentry PEMF blanket has been designed to cover all the major muscle groups. With eight large coils, two coils for top line support, coils for the hamstring muscles and inside stifle coils, this blanket is a must have for the very athletic, the injured or the aging horse. Our engineers have decreased the weight and increased the power and convenience for you. The Sentry has LED lights on each coil for visual verification of pulsing, built in PCU timer and 7 pulsing frequencies to choose from.