Item Type: Motor Tachometer Material: ABS, Stainless Steel Working Voltage: DC 7-30V Plug: US Plug 100-240V Hall Sensor Wire Length: Approx.2m/78.7in Display: 4 Digits Alarm: 50dB Sound and Light Integrated Package List 1 x Motor Tachometer 1 x Power Adapter 1 x Accessory 1Accurate and Stable: The motor tachometer has good stability, high measurement accuracy and strong anti interference ability. 2Memory Storage Function: The RPM speed meter has memory function, the set parameters will not be lost after power off. 3Multi Function: Equipped with sound and light integrated alarm, can monitor the motor speed in real time according to the set parameters. 4Easy Installation: The meter adopts standard size, easy to install, with reverse polarity protection, power supply voltage range DC 730V. 5ABS and Stainless Steel Material: Made of ABS and stainless steel material, has high strength, good rust and corrosion proof, sturdy and durable.