Features:<br />The 7.83HZ Schumann Wave can help people relax physically and mentally, improve body health and work efficiency, reduce mental stress.<br />The 7.83HZ Schumann Wave Ultra-Low Frequency Pulse Generator is of high accurancy and stability.<br />The pulse generator is adopted with high stable frequency acquisition elements, precision correction capacitance, precision multi-loop adjustable resistor, display solid capacitance.<br />Equipped with high-quality lithium polymer battery, with overcharged, over-voltage, over-current protection. There is almost no voltage ripple in the voltage supply.<br />You can apply it in your bedroom, office, study, tea room and so on.  <br />Easy to operate, with a USB cable and a screwdriver for easy installation.<br/>Specifications:<br />Battery: Lithium polymer battery<br />Battery capacity: 850mah<br />Time: charging current 250mA, 6 hours full of electricity<br />Working current: 7mV<br />Working time: 200 hours(full of electricity)<br />Power: 5V micro-usb android charging cable<br />Material: Metal<br />Color: Multicolor<br />Weight: 71g/2.5oz<br />Item Size: 6.8*5.2*1.2cm/2.7*2*0.5in<br />Package Size: 10*6cm/3.9*2.4in<br/>Package List:<br />1*Ultra-low Frequency Pulse Generator<br />1*USB Cable<br />1*Screwdriver