The SG90 is a 9 gram servo motor that can rotate 0 – 180 degrees (roughly) at a rate of about 0.3 seconds (0.1s/60 degrees). The SG90 is used in low-cost projects, typically with motorized vehicles and robotic arms.
A nine-volt battery is usually used in smoke alarms, smoke detectors, walkie-talkies, transistor radios, test and instrumentation devices, medical batteries, LCD displays, and other small portable appliances.
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