Listing is for a brand new single 5.6mm Osram PLTB450B 1.6W 450nm LD Diode. The PLTB450B is the lower divergence alternative to the 445nm M140 or Nichia NDB7875 9mm diodes. Diodes are current hungry and as they heat up their internal resistance is lowered causing them to want to draw more current. Dont attempt to connect the diode directly to a fixed voltage source like a battery. You must use a "constant current" power source like a current limiting driver or variable current power supply with the current limited to no more than 1.8A or you diode will suffer thermal runaway and die. *Disclamer* By purchasing these diodes you are agreeing to the following. - You are over 18 years of age . - You understand that these components that are mentioned above are dangerous when not properly assembled into a finished product. - You will use these as components and properly incorporate them into a finished product. - You will use these diodes/modules in a safe and responsible manner and for a legal purpose. - You are legally responsible for the use of these components, improper use of these components or their end products. - You are legally responsible for any injury to anybody resulting from the use of or assembly of these components or their finished products. - You Accept this diode/module as a COMPONENT for integration in a system of YOUR OWN design and will be legally responsible from any and all LIABILITIES These Diodes and Modules are sold solely as a component for incorporation into the customers end products. Therefore, this diode/module is exempt from compliance with the appropriate requirements of FDA 21CFR, section 1040.10 and 1040.11 for complete products.