The tool is a digital measure tape combined with IR distance meter for daily household measurement or the professional decoration worker measuring tasks. Features: 3-in-1 Distance Measuring Tool: it combined with a 5m traditional measuring tape, digital measure tape, and 30m/40m infrared distance meter in a single unit. Infrared Measurer: the measure range up to 40m, installed with full functions of area, volume, pythagoras 2&3 points measurement, and 20 sets of memories could be read over. Digital Tape Measurer: precise figures are fast displayed on screen when the measure tape are pulled out. Area and volume functions are workable under the digital display mode. Besides, the tape lock prevents any possible harm to ensure safety operation. LCD Display: 2.0-inch black screen with backlight, the measured data are easily to read even in dark environment. Lithium Battery Power Supply: built-in the rechargeable battery makes it more economical and environmental. Compact Pocket Size: square design in horizontal lines structure guarantees precise results. Smooth surface and round edges to enhance the comfortable hand feeling. Specifications: Measurement Range: 40m Material: ABS IR MEASURER: Range: 40m(131ft) Measure Accuracy: ±(3.0mm+5x10^(-5)D) Unit: m/ft/in/'" Reference: Front/Rear IR Class: Class 2 IR Type: 630-670nm Measurement: Single Measurement, area measurement, volume measurement, pythagoras measurement LCD: 2" black screen History: 20 sets Device off: 180s IR off: 30s Backlight off: 10s Battery: 1 * 3.7V 300mAh rechargeable lithium battery Working Temperature: 0~40℃ Storage Temperature: -10~60℃ USB Port: Micro USB TAPE MEASURER: Length: 5m / 16.4ft Tape Accuracy: ±1.5mm Digital Accuracy: ±2mm Tape Width: 19mm Horizontal Stand-out: ≥1.8m Measurement: Area measurement, volume measurement Tape Unit: ft/in