18650 Battery 5V 1.8A Power Bank Charger Module Soldering Stand 1x Soldering Iron Stand

1x Soldering Iron Stand

3V pulse if you solder SJ2 closed on the A3967)

you can use 3

if you didn't have this ultra-cool TCA9548A 1-to-8 I2C multiplexer

We recommend installing "Bluetooth master module"

18650 Battery 5V 1.8A Power Bank Charger Module Soldering Stand 1x Soldering Iron StandA modular charging discharging control board for 3. 7V Lithium Battery powered mobile power banks. Output: DC5V 2A max, input DC5V 1A, Android line interface Battery voltage: 3. 7 4. 2 lithium battery B Negative B+Positive Size: 7. 1x1. 6cm 2. 80x0. 63inch Note: the battery must be in parallel rather than in series. Test voltage before installation. One bad battery will affect the whole group battery. Recognize the positive and negative. If you put