Full load of CPU and GPU, useful for: 1. Generate heat, use your phone as hand warmer; 2. Heat your phone to remove moisture 3. Heat up your phone when the temperature is too low, to help to increase your battery life time. Because in the low temperature most of lithium battery capacity will low down; 4. Test other app behaviors when the CPU and GPU are heavy load; To generate maximum heat, please do: 1. Connect external DC power; 2. Disable all battery saving and app optimization options, whic