Resistance to water pressure 1.75MPa working voltage range DC5 ~ 15V insulation resistance 100m precision [in 1 25L / MIN] 5% high-level output pulses DC 4.7 V (DC input voltage 5 V) pulses of output low level less than DC 0.5 V (input voltage DC 5 V) Pulse service cycle of 9 outputs 50% 10% Note: Due to the different production batches, the details of the article may be a little different. about the difference, buy it carefully. There may be a difference of 1 to 3 cm due to manual measurement. Because of the different screen and the different light, The image may not reflect the actual color of the item. Thanks for your understanding. colour:Brass Material:metal size:58mm Package Contents: 4 * Water flow sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.