Table 1.

Cost estimation of the smart wristband.

Components	Cost (USD)
MICS5524 MOX gas sensor	9.60
ESP32 Microcontroller	5.33
3.7 V LiPo Battery	3.82
Step-up module	0.85
Jumper wires	0.96
Device enclosure	4.05
Total	24.62

The cost was converted from THB when 1 USD = 35.30 THB.