Quantity   Component name
1 × Seeed XIAO nRF52840 Sense
1 × 1S LiPo 3.7 V 100 mAh with BMS/protection
1 × 20 mm hydrophobic PTFE filter membrane disc
1 × 10 mm quick-release safety collar
1 × Seeed XIAO ESP32-S3 — BLE to WiFi gateway
1 × USB-C cable and 5 V supply