Typical application: 1. Receiver for hearing aid instruments (bte / ite / cic / iic) 2. Woofer/wideband driver for headsets & headphones 3. Transducer for blue-tooth headsets Product features: 1. High output, low energy consuming to extend the life 2. Enhanced bandwidth 3. Low thd level 4. Waterproof & rf radiation shielded 5. Substantial /excellent mechanical-shock resistance Pet bubble pack, 2 pc per bubble, 200pcs per pack