Review on 🔌 iUniker Power Switch for Raspberry Pi 3, Pi 2, B+, Zero W - 4-Pack, Raspberry Pi Power Supply Cord with On/Off Push Switch, MicroUSB Female to Male Cable by Kesha Walker

UPDATE: 2019-01-31 ================== When I actually bought this - I blindly assumed it would support data transfer for my ESP8266 and ESP32 microcontrollers, but it doesn't. But since it was my own fault for not reading the other reviews before ordering, I decided to keep it for my Raspberry Pi. Today I had the chance to test it on both the Raspberry Pi 2 and 3 - with a 5V 3.4A power supply. . Both complain about the voltage drop. I bought 4 packs and they all have the same problem. So I decided to put it back where it belongs. ORIGINAL: ========== Be careful before buying. Garbage!