... .Safe,effective, easy operation HG-2A Red Light Therapy Instrument Main technical: 1 Output power: to be adjustable continuously, max. 3W ± 25 ... the output window is 20mm).3 timer functions: 0 ~ 60mis adjustable, the error does not exceed ± 10%Count down time function ... , and heat (endotoxin) and other dissolved death. 2012 New Model HG-2A Red Light Therapy Instrument