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Hi every one this project is a Key finders, also known as key locators, or electronic finders, are small electronic devices used to locate misplaced or stolen objects, such as keys, luggage, pets, or tools, and to transmit alerts.
e.g., that one’s restaurant table is ready or a nurse is needed. Some key finders beep or flash lights on demand.

Components required

1. Hc-05
2. Attiny 45/85 IC
3. Buzzer
4. Switch
5. Battery & charger (I used 3.7v liPo battery with charger).
6. 8 pin IC stand (optional for reprograming or reusing the At tiny ic).
7. small Doted bord.
8. some wires & lead to soldering.”

Link to article