Description Hpumps 35 mini series is the smallest size of our air pumps,Website:://.heyipump.net, made of piezoelectric ceramic plate ,suitable for the <50L of fish tank Features Ultra slim and smallest size of air pump world Low power consumption, stable performance <28dB, the most noiseless in the world of air pump Product Info. Model    3501 3501A Vol/Freq.         220V,50HZ 110V,60HZ Dimensions         Dia 44*20 Dia 44*20 Weight                 25g         25g Noise                 28db         28db Power                 1.6 watt 0.8 watt Pressure         12kpa /-10% 10kpa /-10% Flow Rate         210mm /-10% 200mm /-10% Water Depth         600mm         500mm Tank Volume         < 50L         < 50L Attachments 1pc of Air Tube Inner Dia. 4mm                 Outer Dia. 6mm                 Length 1000mm 1pc of Air Stone Dia.25mm 1 Power Adapter         Based on actual power supply and electric plug type 1 Suction Cup:         Integrated