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1. Working voltage: 3.7-5V DC 4. Bluetooth module operation: Turn on the Bluetooth of the mobile phone, scan the device, find "JZ-B5W2"and click to connect 3. Power :5W 2. Size :40x20x12mm(length x width x height) 5. This Bluetooth is version 4.2. Compatible with all mobile phones and Bluetooth adapters on the market. The transmission distance in open land is about 15 meters. Automatically connect back to paired devices and automatically.