1) Portable & Convenient Operation >> Small size and handheld, specially design for household use. 2) Long Duration Time >> A rechargeable 5200mAh lithium battery inside, when fully charged for 2 hours, its duration time reach 7 days. 3) Obvious Effect >> Perfect combination of medical 3pcs 808nm and home 12pcs 650nm laser diodes, effectively treat acute/ chronic pain. 4) LCD Screen >> People clearly see the digital display on treatment time, Power, Battery Capacity and Working mode. 5) Totally Physical Therapy >>The low level laser therapy technology is totally physical, safe, non-invasive and no any side-effect.