1 Comparison to the original Quell device
2 Comparison to leading OTC TENS devices, based on retail sales data. Maximum sustained energy when used as directed.
3 Unpaid testimonial. In a 60-day home use test conducted among 88 Quell users with lower extremity and/or low back pain, 4 out of 5 participants reported an improvement in their pain with regular use of the device. Results may vary.