If it’s in the factory position in front of the radiator then heat shouldn’t be a problem, but it does catch the wet and crap in bad weather. I would suggest perhaps getting a “known” manufacturer eg Hella or similar.
If you fancy making a little project out of it, I managed to squeeze a pair of regular car horns in the space behind the engine/above gearbox. Now sounds like a proper vehicle, not a kids moped. 
Always hated the look of the afterthought stock position and embarrassing sound.
See half way down one of my old posts.
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