DAOKI 10PCS PFM Control DC-DC Converter Step Up Boost Module 600MA USB Charger 0.9V-5V to 5V Power Supply Module Product Name : Voltage Step Up Boost Module;Input Voltage : 0.9-5VDC Output Voltage : 5VDC;Input Current : 600mA Total Size : 34 x 18x 10mm/ 1.3" x 0.63" x 0.4"(L*W*T);Material : Plastic, PCB, Copper USB female, can direct power to the USB interface device with USB female versatile PCB size: 25(mm) x 18(mm) ultra-small size, installed in a variety of small equipment