Here are some Amazon and Ebay links for the more obscure/specific materials. No doubt these will quickly become obsolete.
Locket:
https://www.amazon.com/dp/B01B3BT3G6/
https://www.amazon.com/dp/B072MB7G9S/
https://www.amazon.com/dp/B00YT2PWCG/
ID107 nRF51822 based Generic Activity Tracker:
https://www.amazon.com/Fitness-Tracker-SCODE-ID107-Monitor/dp/B01N2UH3TH/ref=sr_1_20
https://www.amazon.com/Wristband-Waterproof-BIGFOX-Activity-Bluetooth/dp/B06XXFBB5Z/ref=sr_1_8
Buzzer:
Hello! Cool stuff. Just like in spy movies. I know a great resource that could do software development for such a thing. On site qa services you can order an application of any complexity. The company in which I work, I will not call her, but she is quite famous, often use their services for their own purposes