Lord of volume
Trying to plug your laptop into your school's PA system? This nifty interface from RapcoHorizon converts the audio output from your laptop (or other consumer electronics device) to a mic level balanced signal that you can plug into your mixer. It's small enough to fit in your pocket, and the rugged aluminum chassis and hand-soldered connections ensure long-term reliability. The LTIBLOX Interface also keeps things admirably simple by giving you one knob for total volume control.
The 3.5mm male input accepts the signal from most laptops, MP3 players, and portable CD players, while the XLR male output connects to your mixer. Warranty: limited lifetime.