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- Easy-to-use Large Back light LCD Display Accurate FHR detection with clear sound. Numeric & Curve display for FHR Auto / manual FHR counting Date and time function Auto Power off for power saving i-ion battery and battery level indicator Display : 60mm X 27mm LCD Display Hart rate Range :50~210bpm Resolution :lbpm Audio sampling frequency : 4KHz /8KHz Size: 30 (Depth) X 85(Width) X130 (Height) mm Audio output power :0.5W Auto shut off: 1 minute Weight: 250 g (including one Battery)