Quantity   Component name
1 × Wemos D1 mini Esp8266 with integrated USB interface
1 × 2450 Coin Cell Battery Lithium 3V
1 × CR2450 Coin Cell Battery Holder
1 × Supercap 3.3F 3.0V Use one with little leakage current, like: https://www.conrad.com/ce/en/product/1529294/EDLC-33-F-3-V-x-L-8-mm-x-20-mm-VINATech?ref=searchDetail
1 × Resistor 120 Ohm Axial 0.25 watt