Quantity   Component name
1 × 1"x1.5" Oval Locket There are tons of variations on Ebay and Amazon. Just search for "oval locket".
1 × ID107 nRF51822 Generic Activity Tracker Any small nRF51 or nRF52 based activity tracker will work but in this tutorial we'll use the ID107
1 × MLX90615 Thermopile Contactless Thermometer
1 × Internally driven 3.5v mini buzzer This has a resonator built in. Don't get a buzzer that requires an external signal. Diameter: 12mm, Current:
1 × SMD style micro switch