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2. 6 Electronics Retirees Should Buy From Costco on Black Friday

   www.aol.com/finance/6-electronics-retirees-buy...

   This system includes four wireless outdoor cameras and two indoor plug-in cameras. You can snag this system for $199.99, which is a $200 savings off its normal price. Sonos Sound System

3. Daylight harvesting - Wikipedia

   en.wikipedia.org/wiki/Daylight_harvesting

   Daylight harvesting systems use daylight to offset the amount of electric lighting needed to properly light a space, in order to reduce energy consumption. This is accomplished using lighting control systems that are able to dim or switch electric lighting in response to changing daylight availability.

4. Lighting control system - Wikipedia

   en.wikipedia.org/wiki/Lighting_control_system

   These devices may include relays, occupancy sensors, photocells, light control switches or touchscreens, and signals from other building systems (such as fire alarm or HVAC). Adjustment of the system occurs both at device locations and at central computer locations via software programs or other interface devices.

5. Photoresistor - Wikipedia

   en.wikipedia.org/wiki/Photoresistor

   Three photoresistors with scale in mm Large CdS photocell from a street light. A photoresistor is less light-sensitive than a photodiode or a phototransistor. The latter two components are true semiconductor devices, while a photoresistor is a passive component that does not have a PN-junction. The photoresistivity of any photoresistor may vary ...

6. Forget Extended Warranties. Here's Why You Don't Need One - AOL

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   While Costco limits returns on electronics and appliances (purchases that often come with a push to buy an extended warranty) to 90 days after purchase, you can return nearly anything else at any ...

7. 3 Reasons Not to Buy a TV at Costco - AOL

   www.aol.com/3-reasons-not-buy-tv-123017951.html

   In fact, Costco only carries TVs from six brands: Samsung. LG. Sony. Hisense. TCL. Sanus. If, for example, you want a TV from popular brands like Vizio, Panasonic, or Toshiba, you wouldn't have ...

8. Resistive opto-isolator - Wikipedia

   en.wikipedia.org/wiki/Resistive_opto-isolator

   Opto-isolator VTL2C1 with LED input and photoresistor output. Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator [notes 1] or lamp-coupled photocell, [1] is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically ...

9. Best Outdoor Gear for Summer at Costco - AOL

   www.aol.com/finance/best-outdoor-gear-summer...

   $430. Shop Now. This trendy stand-up paddle board comes with everything an adventurer needs (except a sense of balance, that is): a paddle, pump, leash, dry bag, storage bag, and repair kit.