HG vein Finder ECO is new limited edition vein finder device. We thank you all for support and great feedback and Grateful for success of our HG Vein finder HGVF637. As Gratitude To our customers we have launched a ECO model . As simple as always and easy to use device with new look . The vein finder device is a device to assist the healthcare professionals for vein access . As given in user manual follow simple steps to easy and accurate Vein access by transillumination of THZ . Separate on-Off sliding switch , 3 intensity modes sliding witch for different skin tones and adjustments. Built-in 3.7v 800 mAh long lasting lithium ion battery . HAZMAT approved . Universal charging socket micro USB , So you can charge the unit by power bank , laptop , PC, Android charger . Also a free charging cable is given in box . Charging indicator light. Red =charging Green=fully charged . CE and ISO certified. The hook and loop HG tourniquet belt can be attached to unit (not included in box of HGVF eco ) THZ vein transilluminator technology , Enhanced Visibility Provides Much Clearer Vein Visibility Easy on-off switch, 3 intensity mode switch, Adult Vein Finder for Obese, Dehydrated, Low Bp, High Trauma and Emergency Use USB charging port and charging indication, Diamond finish ABS material Made in India, CE and ISO certified .