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2. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   A common battery type in cameras and photographic equipment. In Switzerland as of 2008, these batteries accounted for 6% of lithium camera battery sales. [75] 2CR5: EL2CR5 DL245 RL2CR5 KL2CR5 6135-99-577-2940 (NSN) 2CR5: 5032LC [137] 1,500: 6: Double cylinder. Keyed. Both on one end. Terminal center spacing 16 mm. H: 45 mm L: 34 mm W: 17 mm

3. Internet of things - Wikipedia

   en.wikipedia.org/wiki/Internet_of_things

   Scott Anthony has written in Harvard Business Review that Kodak "created a digital camera, invested in the technology, and even understood that photos would be shared online" [318] but ultimately failed to realize that "online photo sharing was the new business, not just a way to expand the printing business."

4. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   Wireless cameras are also easy and inexpensive to install. [164] Previous generations of wireless security cameras relied on analogue technology; modern wireless cameras use digital technology which delivers cleaner audio, sharper video, and a more secure and interference-free signal. [165]

5. Camera - Wikipedia

   en.wikipedia.org/wiki/Camera

   Leica camera (1950s) Hasselblad 500 C/M with Zeiss lens. A camera is an instrument used to capture and store images and videos, either digitally via an electronic image sensor, or chemically via a light-sensitive material such as photographic film. As a pivotal technology in the fields of photography and videography, cameras have played a ...

6. Lithium-ion battery - Wikipedia

   en.wikipedia.org/wiki/Lithium-ion_battery

   A lithium-ion or Li-ion battery is a type of rechargeable battery that uses the reversible intercalation of Li + ions into electronically conducting solids to store energy. In comparison with other commercial rechargeable batteries, Li-ion batteries are characterized by higher specific energy, higher energy density, higher energy efficiency, a longer cycle life, and a longer calendar life.

7. Remote control - Wikipedia

   en.wikipedia.org/wiki/Remote_control

   Most of these were connected to the set being controlled by wires, but the Philco Mystery Control (1939) was a battery-operated low-frequency radio transmitter, [14] thus making it the first wireless remote control for a consumer electronics device. Using pulse-count modulation, this also was the first digital wireless remote control.