From the Pedaltrain website regarding the Volto:
Key Capabilities
• Reliable and long-lasting power for analog pedals, the kind that use traditional 9v batteries
• Hundreds and hundreds of lifetime recharges with proper care
• Over its life, Volto contains the equivalent of many thousands of 9v batteries
• Easy to recharge worldwide
• Proprietary noise cancellation
Key Limitations
• Not intended for high-draw digital pedals
• Charge life will vary depending on the draw and usage of connected pedals
• Outputs cannot be jumped or combined to modify power output, doing so may cause injury or damage and will void your warranty
• 2000 mA is a measure of peak output not recommended usable capacity
We have designed Volto with two 9-volt outputs, capable of providing 2000 mA (5000 mAh) of peak output. Volto will provide clean, quiet power to as many analog 9-volt pedals as you like. Volto's battery life will vary based on the total current draw of the pedals you are powering. The more pedals you use, the faster the battery will discharge.