Gaumard's innovative green technology allows the HAL® Adult CPR+D Skill Trainer Torso to store the energy generated by chest compressions to power its amazing features. Without the use of batteries or power cords, HAL® is capable of recording CPR quality and performance metrics, presenting realistic chest rise and palpable pulses after resuscitation, and more. Take your training to more places and reach more people with the convenience of truly tetherless technology.