According to FCC radiation tests, the iPhone 3GS has a rating of 0.79 watt per kilogram.

Huawei P9: Co-engineered with the Leica Camera company, this model has a SAR of 1.43.

ZTE Axon 7 Mini - The Chinese company's smaller version of their Axon 7 has a higher SAR of 1.29.

According to research published in Optics Express, the compact, microconcentrator photovoltaic system could provide unprecedented watt per kilogram of power critical to lowering costs for private space flight.

A new compact, microconcentrator photovoltaic system could provide unprecedented watt per kilogram of power critical to lowering costs for private space flight.

The statutory limit value of the SAR in France is set at 2 W / kg, whether the phone is placed at the level of the head or the trunk.

The graphene version has a specific capacitance of more than 150 Farads per gram and can store energy at a density of more than 64 watt-hours per kg at a current density of 100 to 200 watt-hours per kg.

They say it has a specific capacitance of over 150 farads per gram can store energy at a density of more than 64 watt-hours per kilogram at a current density of 5 amps per gram.