two lithium cell batteries

Care: Machine wash cold

extra large o-ring 1-1/4"

Cushiony side gathers that conform to your body

Piezo Limb Movement Sensor / Key Connector Re-Usable Underpads two lithium cell batteriesThe SleepSense Limb Movement Sensor is placed on the wrist or ankle and produces a signal that is directly proportional to the hand or limb movement. The internal Piezo film element converts every movement to a small analog voltage that provides a clear, reliable indication of that movement. The sensor my be connected to any AC (low level) channel on the recorder. 1 Year Warranty Also available in kits Compatible Splitter Cable