Pure battery tone for serious tone lovers! Running your pedals from batteries not only improves tone, but also reduces noise. The Kingtone Battery Box 4X connects your batteries to your pedals with no components in-between! Most other battery boxes use diodes or transistors. King Tone use relays, so there is no loss of voltage or tone. You also no longer have to worry about unplugging your pedals to save batteries. The batteries are automatically connected and disconnected when you power up, or power down your pedalboard. The batteries can be changed in as little as 3 seconds, just pull the old one out and pop the new one in: no screws, no lids, no hassle! Plus, red and white LEDs clearly show when a battery is full or running low. The Battery Box is fully isolated, allowing you to mix and match positive ground pedals with negative ground pedals. Finally, the Kingtone Battery Box 4X has a tiny foot print and will take up to four 9 volt batteries. King Tone Guitar Battery Box 4X Power Supply features: • Four 9V battery slots. • Toggle switch for Automatic, Off and On. • Fully Isolated. allows you to mix positive and negative ground pedals. • Automatically connects and disconnects the batteries. • Standalone mode. • Batteries can be swapped out in seconds! • Dimensions: 4" x 2" x 1.25".