Designator	Component	Number	Cost per unit - EUR	Total cost - EUR	Source of materials
casing (front)	casing front panel	1	0.68 €	0.68 €	Prusa Polymers a.s.
casing (back)	casing back panel	1	0.78 €	0.78 €	Prusa Polymers a.s.
CO2 sensor	MH-Z19B infrared-CO2-sensor	1	18.09 €	18.09 €	Alibaba Group Holding Ltd
ESP32	ESP32 NodeMCU DevKit C V4	1	9.49 €	9.49 €	AZ-Delivery Vertriebs GmbH
OLED display	SSD1306 0,96 Zoll OLED Display	1	6.99 €	6.99 €	AZ-Delivery Vertriebs GmbH
LoRa module	RFM9X LoRa Packet Radio	1	19.59 €	19.59 €	Adafruit Industries
PI B+	Raspberry PI B+	1	30.20 €	30.20 €	reichelt elektronik GmbH & Co. KG
RGB led	KY-016 LED RGB Modul	1	4.29 €	4.29 €	AZ-Delivery Vertriebs GmbH
Buzzer	TMB12A05 Buzzer	1	0.64 €	0.64 €	Conrad Electronic SE
Jumper Wire	Jumper Wire Set	1	5.99 €	5.99 €	reichelt elektronik GmbH & Co. KG
R1 820 $\mathrm{\Omega }$	Resistor 820 $\mathrm{\Omega }$	1	0.06 €	0.06 €	Conrad Electronic SE
R2 1 k$\mathrm{\Omega }$	Resistor 1 k$\mathrm{\Omega }$	1	0.12 €	0.12 €	Conrad Electronic SE
Transistor	PNP Transistor BC557C	1	0.19 €	0.19 €	Conrad Electronic SE
DOT PCB	DOT PCB 100 mm x 65 mm	1	2.00 €	2.00 €	Conrad Electronic SE
Touch plate	Copper plate 15 mm x 20 mm	1	0.09 €	0.092 + 0,09 €	Conrad Electronic SE