Item Type: Motor Tachometer_x005f_x000D_Material: ABS, Stainless Steel_x005f_x000D_Working Voltage: DC 7-30V_x005f_x000D_Plug: US Plug 100-240V_x005f_x000D_Hall Sensor Wire Length: Approx.2m/78.7in_x005f_x000D_Display: 4 Digits_x005f_x000D_Alarm: 50dB Sound and Light Integrated 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 7?30V. 5ABS and Stainless Steel Material: Made of ABS and stainless steel material, has high strength, good rust and corrosion proof, sturdy and durable.1 x_x005f_x000D__x005f_x000D_MotorTachometer 1 x Power Adapter 1 x Accessory