Solar Components, a company that makes portable solar chargers, has raised $2.8 million of an expected $4.9 million in equity, according to a filing with the SEC. Based in Campbell, Calif., the startup makes a waterproof device, called the JOOS Orange, that it claims can power four smartphones on a single charge.

The device, which costs $99.95, can be used to charge portable electronics like cell phones, iPads and digital cameras, but the company also suggests that the JOOS Orange can be used to charge low-wattage heaters, small medical refrigerators and water purification systems. The charger can be powered by the sun or any USB source such as a laptop, and though the chargers are not yet available for sale, the company announced in late September that the units are in production.