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D3X Dual Core Bluetooth 5.4 Helmet Intercom Headset with Waterproof Unlimited Riders. Dual BT5.4 bluetooth chips deliver stable wireless transmission. Built in 1000mAh lithium polymer battery for long standby time. Up to 300 hours standby time for long distance riding. Supports 16 hours call time and 25 hours continuous music playback. Built in AI voice assistant to realize convenient voice control. IPX6 waterproof grade adapts to various outdoor riding conditions. Half duplex intercom with unlimited users within 300 meter radius. Unlimited users music sharing within 300 meter effective range. Switchable automatic and manual answering for incoming phone calls. Multi language voice prompt supports customized voice language.