Built-in Ammeter: The ammeter can measure the current in a circuit. The value of Amps of our 28W solar charger depends on your devices, sunlgiht intensity and cable used. If your device has an input current of 1A (such as the iPhone), the amount of ammeter will show between 0.8A and 1A in theory.
Exclusive SmartIC Technology: With the built-in intelligence chip, our solar phone charger can detects your device then deliver its fastest possible charging speed(single usb port up to 5V/2.4A Max, dual USB ports up to 4A Max overall). Dual-port applys to all the 5V Android devices and apple devices. Note: This solar charger is not compatible with the iPad Pro.
High Efficiency: SunPower Solar Panels with high solar conversion efficiency by up to 21.5% - 23.5%. With compact size (11.1 × 6.3× 1.3in folded) and lightweight (21.0 oz) design, includes 4 clip hooks, which allows you to hook your solar panel everywhere convenient to get solar access (trees, backpacks, vehicle, etc.), so it is easy to carry for any outdoor activities such as camping, climbing, fishing etc.
Special PET Polymer Surface: Industrial-strength PET polymer fabric protects your solar panel and your devices from occasional rain or wet fog. IPX4 waterproof level, but the USB ports and ammeter are not water-resistant, so keep them away from water while charging. the pocket with a zip will keep your devices safe and clean while camping.
Easy to Use: Please unfold four solar panels under outdoor direct sunlight( No cloud and no shadow), then connect your device to the usb port with your certificated cable. A usb cable is provided in our package and not included the lighting cable. Note: Please don't place the device inside the pocket attached when charging in order to avoid overheating then damage your devices.