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$54.00
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You'll never run out of power again! If the battery on your smartphone or tablet is running low... no problem. Just plug your device into the USB port on the top of this portable battery charger, and then continue to use your device while it gets recharged.
With a recharge capacity of 5200 mAh, this charger will give you 1.5 full recharges of your smartphone or recharge your tablet to 50% capacity.
When the battery charger runs out of power, just plug it into the wall using the supplied cable (included), and it will recharge itself for your next use.
Design Details
Detail of a rendering of Mayer's Topophone that appeared in the July 3, 1880 issue of Scientific American. The aim of the topophone, which was... more
Dimensions
1.80" W x 3.875" H x 0.90" D
Ships Within
1 - 2 business days
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Detail of a rendering of Mayer's Topophone that appeared in the July 3, 1880 issue of Scientific American. The aim of the topophone, which was invented and patented by Professor A. M. Mayer, last winter, is to enable the user to determine quickly and surely the exact direction and position of any source of sound. The topophone consists of two resonators (or any other sound receivers) attached to a connecting bar or shoulder rest. The sound receivers are joined by flexible tubes, which unite for part of their length, and from which ear tubes proceed. One tube, it will be observed, carries a telescopic device by which its length can be varied. When the two resonators face the direction whence a sound comes, so as to receive simultaneously the same sonorous impulse, and are joined by tubes of equal length, the sound waves received from them will necessarily re-enforce each other and the sound will be augmented. If, on the contrary, the resonators being in the same position as regards the...
$54.00
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