Bluetooth 4.1 CSR chip 22 hours Super endurance

This product is made of polyethylene terephthalate diaphragm imported from Japan. Each piece of diaphragm is designed into shallow sunflower pattern, strengthening its rigidity while maintaining its performance (Young's modulus). This product is paired with N50 high-performance magnet and Φ0.05mm Japanese big black high-purity coil. The low frequency is strong, powerful and dynamic. It has less noise, deep diving, distinct layers, bright human voice, and mild and full brightness.

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