Premium level design and construction. Red Light and Near Infrared Light Wavelenghts.
There seems to be more pen shaped devices offering red light therapy features.  And, usually, their offerings are only in that specific red light wavelength spectrum.  This product offers both Red Light Therapy and Near InfraRed Light Therapy, 660nm wavelength and 850nm wavelength respectively.  The main difference between the two is the depth of penetration of the light therapy.  Red Light deals more with aspects closer to the surface of the skin, while Near Infrared Light can affect deeper within the skin to more directly affect muscles and subcutaneous tissue.<br />Some assembly is required in this instance.  The bottom section unscrews to reveal the battery compartment. They supply 1 rechargeable battery.  In this design form, when the rechargeable battery goes bad, you can purchase a replacement, and continue using the product.  In other products, with a 'fixed' installed rechargeable battery, when the battery fails, the product is finished.  And, rechargeable batteries do eventually fail.<br />In another clever design move, they made the top section removable, too.  This reveals the usb-c charging port.  There is a small indicator light near the charging port. While charging it glows red, and then green when fully charged.  It takes 4 - 5 hours to fully charge a depleted battery.  The defined treatment session is 10 minutes, after which the device will automatically power off.  The user manual states that it can be operated up to 12 times on a single charge.  So, basically 2 hours of expected operating time.<br />Besides the usual accessories (protective eyeglasses, drawstring pouch and usb power cable), they include a tripod with flexible legs and an adapter clamp to hold the light therapy pen.  This is a smart and clever addition, which allows the user to position the device handsfree.  This addition boosts the rating.  It's an accessory that I never considered with our other light therapy 'pens'.<br />Attached are photos to show real world images, with a ruler for size reference.  Various angles and provided for a comprehensive overview of the light therapy pen, with closeups of key aspects/features.<br />The product offers 660nm and 850nm wavelengths, for Red Light and Near Infrared Light therapies.  It's smartly designed, with the product exhibiting quality materials and construction.  It satisfies expectations for a portable, reliable dual wavelength light therapy pen.  Thus, earning a 4.75+ star rating, with a very high level recommendation.
Rating: 5 stars