At the cheap end of the scale is this product for £9.99 delivered. Cycle computer with lots of features and backlight (not gps). Also powerful light with fog lights and side lights, there is a remote control for light and horn operation, also alarm feature and its quite powerful with regard lumens, horn output and battery capacity. Probably easy to replace the batteries down the line as suspect it will be those 18650 cells inside. What quality it is, is another matter. Such products can be hit or miss. I think I read it has some ebike features related to setting range etc. I'd imagine not a bad option to keep the weight down as you are combining so many things into one item.
View: https://www.amazon.co.uk/gp/product/B091YRQ3G2
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This just falls in the e-waste category sadly. It's unlikely to do anything that it says it does well, or at all. Pretty much guaranteed to end up in landfill shortly after purchase.