use all fixed capacitors, 36U thick circuit boards, high Q inductor with LED display Working time is recommended to use less than the current of 2.5A exceeds 2A heat sink (10W output above); Because the downward module, to a stable output, keep a minimum pressure 1.5V. Output current:3A (max) Conversion efficiency:92% (maximum) Residual ripple:30 mV Switching frequency:65 kHz Working temperature:-45 centigrade - + 85 centigrade Precautions The positive input IN + IN negative input! The positive output OUT + OUT- output negative! Note that input and output can not be . Reversing could burn! Input:DC 3V to 35V (the output voltage of the input must be higher than the voltage can not be increased above 1.5V.) Output:DC 1.5V to 35V voltage is continuously adjustable, the maximum efficiency output current of 3A. Colour:As Shown Material:Metal Size:43mmx21mmx14mm Package Contents: 11 * DC converter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.