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Active sonar generates a loud “ping” or series of pings and then listens for echoes. The initial pulses of noise reflects off objects to effectively paint an image, in a process known as echolocation.
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Another place Apple cut costs is the trackpad. All Mac laptops besides the Neo have a “Force Touch” trackpad that doesn’t actually move. Instead, Apple’s Taptic Engine provides subtle haptic feedback to confirm various actions. It can also sense pressure. Those features are absent on the MacBook Neo — it’s a more standard throwback of a trackpad that physically moves when you click it.