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For purposes of air conditioning, the Han dynasty craftsman and engineer Ding Huan (fl. 180 CE) invented a manually operated rotary fan with seven wheels that measured 3 m (10 ft) in diameter; in the 8th century, during the Tang dynasty (618–907), the Chinese applied hydraulic power to rotate the fan wheels for air conditioning, while the ...
The cooler's hexagonal shape has a 55+ quart capacity. [7] The cooler is powered by a rechargeable lithium-ion battery and the removable Bluetooth speaker is also rechargeable and can be paired with a second speaker up to 30 feet away.
Walton Micro-Tech Corporation is situated near the Walton Hi-Tech Industries Limited’s factory at Chandra in Gazipur. It is the manufacturing, assembling and R&D plant for Walton's electronics products such as batteries, mobiles, televisions (CRT, LED), home appliances (blender, rice cooker, induction cooker, air fryer, rechargeable fan, air cooler, hair dryer, DVD players etc.), electrical ...
The headphones feature four air purification settings and adaptive functionality for tailored air delivery. With advanced active noise cancellation (ANC) using 11 microphones, they can reduce external volume significantly. The headphones boast a long battery life of 50 hours for audio and include technology for clear voice calls.
A rechargeable battery, storage battery, or secondary cell (formally a type of energy accumulator), is a type of electrical battery which can be charged, discharged into a load, and recharged many times, as opposed to a disposable or primary battery, which is supplied fully charged and discarded after use.
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