Personal Mini Bluetooth Speaker Development

I'm looking for a developer to create a mini Bluetooth speaker Prototype.

Key Features:
- Slim design for portability
- High-quality sound with a ping-like quality
- Vibration feature
- Short- Life battery with a charger port
- Bluetooth connectivity only, no AUX or USB

Ideal Skills and Experience:
- Proven experience in designing and developing audio devices
- Expertise in Bluetooth technology
- Strong understanding of sound quality and speaker design
- Experience with creating portable and durable products
- Ability to design for a slim, compact size

Please provide examples of previous similar projects in your bid.