Quantity   Component name
1 × IOT Cricket - Wi-Fi module £16 ThingsOnEdge.com
1 × AAA Battery holder £1.59 eBay
1 × 16mm Button £1.25 eBay
1 × Mini enclosure 74 x 50 x 28mm £4.25 eBay
1 × Teckin WiFi plug £8.50 (cost broken down from a bigger pack) Amazon
1 × Dupont cables £0.99 (pack of 20 mixed) eBay
1 × 6 Pin male header £0.99 (pack of 6 mixed) eBay
1 × 2x AAA £1.20 (cost broken down from a bigger pack) Amazon
1 × VHB Clear Double sided tape £3.75 eBay