It is safe to install your Lockly device in direct sunlight, although if it is in constant direct sunlight and heat, we do have sun visors for our locks that are in either Satin Nickel or Matte Black.  If you need to order a sun visor for your lock to protect the screen from the sunlight you can email us at help@lockly.com or by calling 1-669-500-8835 Monday to Friday from 7am to 7pm PST and we can send you an invoice for as many sun visors that you need in those two finishes.  Currently, we do not have a sun visor in Venetian Bronze.