Teenage Engineering OB–4 Magic Radio, red Voltage Controlled Filter The knob on the left

The knob on the left is the gain

That’s why you never have enough of them

Bruno Mars

+12V =70mA

Teenage Engineering OB–4 Magic Radio, red Voltage Controlled Filter The knob on the leftOB4 is T. E.'s portable high fidelity bluetooth loudspeaker featuring a 40 hour rechargeable battery. listen using line input, bluetooth, FM radio or disk mode. OB4 memorizes everything you play on an endless looping tape, so you can rewind the radio and remix anything, all in OB4. features a folding handle that doubles as a stand and extended antenna. bluetooth, FMsignal, line in and disk mode 72 hrs radio listening on a single charge or 40 hours of