Eneloop technology inside and can power a whole slew of daisy-chained devices. Charge it up for 3.5 hours and it'll provide 9V DC of output to whatever you like, powering a 10mA effects pedal for a whopping 50 hours. That's about 10 times longer than a simple 9V battery and, unlike one of those, the Pedal Juice will provide a constant 9V right up until it's dead. It even promises less electrical interference than using an AC adapter. All that for $149.99, which may sound like a lot for a battery pack, and it is, but real musicians know that success doesn't come cheap.