F1 - 4 in 1 USB flash drive, with usb 2.0, classic, c-type and lightning. Readable among computers and all smartphone devices
F2 - Laptop cooling pad. Especially for those who use their laptops for gaming or rendering tasks, you just plug it on your laptop's usb port.

F3 - Phone cooling pad. Especially team iPhone, I know that 'iPhone needs to cool down before you can use it' message is annoying.

F4 - Multi USB port extender. You don't have enough USB ports on your laptop? No worries, just buy this and extend 1 USB port into 4.