Acxico 2Pcs 360 Rotary Backpack Hat Mounts Clip Fast Clamp Mount for GoPro Hero 2 3 3+ 4

360 Rotary Backpack Hat Mounts Clip Fast Clamp Mount for GoPro Hero 2 3 3+ 4Description:LED power indicatorModule is easy to use, very intuitiveButton to switch measurement of the input or output voltage, and LED indicates the current measurement of the input or output voltageThe voltmeter can be turned off by another buttonModule using 12A one piece of high quality inductor, input current can be reached at 7A, similar products on the market are used in ordinary 5A inductor, performance parameters vacuity, so you must pay attentionSpecial precision voltmeter can also be manually calibratedApplication:DIY a regulated power supply, 5V input can be output 5-35V adjustableThe power supply for your electronic equipment. For example, 3.7V lithium boost to 5V for mobile power; 7.4V or 12V boost to the laptop power supply to 19VAs the vehicle power supply for your laptop, PDA or a variety of digital products supplyVoltmeter manual calibration method100 Percent new and high qualityInput voltage range: 3-35VDCInput current: 7AOutput voltage range: 3.5-35VDCOutput current: 6A Conversion efficiency: 96 Percent (max)Voltmeter range: 4 to 40V, error +-0.1VMaterial: PlasticSize:67x42x16mmColor: As picture showsWeight: 114gQuantity: 2PcsNote:Light shooting and different displays may causethe color of the item in the picture a little different from the real thing.The measurement allowed error is+/-1-3cm.We highly appreciate all custome rsopinions to improvethe selling, also if any