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Bluetooth specification:2.0 Range:10M 4ultrasonic sensors to detect the distance of theobstacles(detect range:0.3-2.0m;detect angel: H>80? V>70?) DSP technology, Full duplex, noise and echo suppression. Voice dialing, last call redialing, and call switching function. Built-in high intelligent microphone and powerful speaker. Super bright LED caller NO. display