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When reversing, speed must be low. - Detect obstacle with bibi sound alarm and display the data of obstacle distance. - Alarm distance: 0m~2.0m. - Alarm frequency: 1.6-2.0m: 0.5 HZ(slowness); 1.1-1.5m: 1 HZ(slowness); 0.6-1.0m: 3 HZ(commonly); 0-0.4m: BI----- ;.
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