The double-layer special design has a built-in 12V7Ah lead-acid battery, which has a star indicator function, an independent battery compartment, an imported body, and a waterproof function. The components imported from the United States can be equipped with a Bluetooth hand microphone.
It has 2-wire and 4-wire communication cable interfaces, recording output interface, call handle interface, headphone interface. The charging interface is a positive and negative pole.
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