The Module KA2284 is a Battery, Power and Audio Level Indicator.

The NRF24L01+ Module is an excellent wireless communication option between devices like the Arduino.

2.4 GHz 3dBi foldable antenna with reverse bias - SMA RF connector. Perfect for prototyping with RF ICs and Xbee modules. 50 ohm impedance. 10.16cm in length.

We have no idea what USB device you are hooking up to, but if you want to access the microUSB port on something, you might want this.

These wireless receivers work with our 434MHz transmitters. They can easily fit on a breadboard and work well with microcontrollers to create a very simple wireless data connection. Since these are just the receivers, they will only work one way data communication, you would need two pairs to act as a transmitter / receiver pair.

This is a fantastic find for SFE. A small, high-quality, quad-band, standard SMA terminated, cellular antenna.