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1. Use the main bluetooth CSR chip, bluetooth v2.0 protocol standards. 2. Module operating voltage 3.3 V. 3. Potter default rate of 9600, the user can be set. 4. Product Size: 38.8mm x 15.7mm x 2.35mm. 5. Operating current: compatible with 30 MA, compatible with 8 MA communication. 6. Used for GPS navigation system, electricity and water gas m