The RF Explorer ISM Combo (Digi-Key part number 1597-1174-ND and Seeed Technology part number 109990014) is a nifty little low priced hand-held spectrum analyzer. It comes with two antennas, one telescoping sub-GHz wide-band antenna, and one whip helical 2.4GHz antenna.
The unit is powered by an internal rechargeable lithium-ion polymer battery. To charge the battery one needs a mini-USB cable, which is NOT included. Note, this is a “mini” USB cable, not to be confused with a “micro” USB cable.
Here is an example cable one might use: