Character Model: ZL25-02 Working Voltage Range DC: 4.5V-12V Rating Power 4.5V: 0.5-2W/ 6V: 1-3W /12V: 2-3W Static Water Head: 0.4-2 M Static Flow Rate: 0.6-1.8 L/min Lifespan: Continuous operation under normal working surrounding >20000Hr Working Environment Liquid: From weak acid to weak base?workable both on land and in water (Submersible) Max Noise: Under normal working condition, 1M distance over the test instrument