Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si Type: Logic ICs Condition: New Dissipation : no Operating Temperature: no Package: DIP Application: no color:blue Material: metal + pc Features: This product is Schumann wave 7.83HZ very low frequency generator, features high accuracy and stability. High stable frequency acquisition elements: high stability chip, correction capacitance, multi-loop adjustable resistor Module size: length and width (102 * 80mm) Frequency: 7.83Hz Rated voltage: DC 5V Rated current: 0.5A Notice:the Switch only for the indicator light ON/OFF Package Contents: 1 * motherboard 1 * USB charging cable 1 * screw package Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.