How much does a simple key loader weight?

I'm curious to know, how much does a simple key loader typically weigh? Given the nature of these devices, which are often designed for portability and ease of use, I'm assuming they wouldn't be overly bulky or heavy. However, precise specifications can vary depending on the model and manufacturer. Is there a standard weight range that these key loaders tend to fall within? Or does it vary significantly based on features and components? I'd appreciate any insight you can provide on this matter.