To elaborate further, BETA don't use conventional systems of detection - camoflage and stealth don't work on the BETA; it's been theorised that they hone in on silicon and other electronics and the emissions signatures of powerful computers - according to Yui in the Kamchatka arc, the BETA find a powerful computer next to a human to be irresistable.
The stealth measures of the Black Widow II and Raptor were oriented against human opponents, which has caused no small amount of consternation in the international community.
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