Adopted best German brand laser diode 980nm, lifespans is more than 10 years Calculate the laser treatment energy dosage automatically With one set of end of 3 balls free Class 4 laser mini works excellent for musculoskeletal disorders, neuropathic pain, after surgery rehabilitation, etc Please kindly note, Class 4 Laser we don't accept returns. For the client from USA / CA, we will ship by UPS and included import duty.