Description: 1. onboard AMS1117-3.3 chip2. onboard DC input voltage range of 4.75 V to 12 V3. the onboard 7 * 7 self-locking switch, convenient to control power supply turned on and off during the test4. the onboard power light, indicating whether the power supply5. 4-way output voltage interface, convenient connection during the test6. The board size: 48.5 (mm) x12.5 (mm) Package included: 3 x AMS1117 3.3V Power Supply Module With DC Socket And Switch