Product Features: 1. Support data addition and subtraction 2. Support function measurement (area calculation， volume calculation) 3. With referenced laser point 4. Support data storage (3pcs) 5. With screen backlight 6. Support m/ft. conversion 7. 30 seconds idle to automatic shutdown 8. Detect the ambient temperatureMaterial: ABS Color: Orange Size: 155 x 70 x 48mm Battery: 9V battery x 1 (not included) Measurement data unit: foot and meter Accuracy: 0.5% + 1digit (8-60 feet) Operating frequency: 40kHz Operating temperature: 32 to 109.4 ??F (0 to 43 ??C) Measuring range: 2-60 feet (0.6-18M) Operation: To use laser， please press the "LASER"， if it is idle for 5 seconds， the laser function will be automatically shut down. 1. Press "MEASURER" to open this device， when the voltage is stable， you can see the current ambient temperature， if idle for 30 seconds， it will automatically shut down. 2. Press "MEASURE"， the radar of this device will measure the distance from the device to the other end needed to measure 3. Repeat press "FEET" or "METER"， "FEET" indicates measurements in feet， or "METER" indicates measurements in meters 4. If your measure range is less than 2 feet (0.5 m) or greater than 60 feet (18.288 meters)， it will show "ERROR" 5. Press the "STORE" button， you can store the measured data in memory card M1， M2 or M36. Please press M1， M2 or M3 card to store your data as you select7. If you want to delete all the data， then press the "ALL MEMORY CLEAR" for 3 seconds， and then all the data， also M1， M2， M3 will temporarily disappear. (Note: After you delete， date and sound can not be saved)1 x Distance meter 1 x English user manualIn color box package