Idec SA1U-T50MT 50 Meter Relay Contact Heavy Duty Photelectric Sensor

LED - Light Emitting Diode - a small light source

heavy - A concept of weight indicating an item may require some effort to lift or move

LED - Light Emitting Diode. A bulb that is very efficient at producing light. Often small.

Performance - When someone is presenting a form of entertainment, also how well someone is doing within a role.

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