Seeedstudio 3.6V Micro Hydro Generator Pro Built-in Lithium Battery. Built-in Lipo Charging Circuit. Stabilized Voltage Ouput. High Battery Capacity. Working Pressure: &lt; 2KGF. Pressure Drop: 0.4 Bar (3.0 L / Min ). Peak Current: 1.4 A. Stand-by Current: Max. 1.4A. Voltage Output: 3.6VDC--- 700mAh. Power Output: 125mW (4LPM). Battery Capacity: 700mAh. Max. Flow: 20 L / Min ( 2KGF). Water-resistance: IP4. High limited voltage: 4.3VDC. Dimensions: L 84.5 mm- W 64.5 mm- H 81 mm. Wire Length: 84 mm. Jack Type: JWT C2521 Terminal Plug. Connect Thread Gauge: G 1/2". Weight: 195  5g. Burst Pressure: 20KGF.Normal Operation Temp. 4 C~80 C. Max. Intermittent Operating Temp. 110 C max. 30 min. Generating Model: NACuM Core (PAT NO.DE202006004800). Battery Type: Li-polymer Battery with PCM.