Multifunction measuring mode: Press "FUNCUNITS-1" key to change laser tape measurement mode, followed by area measurement, volume measurement, Pythagorean measurement, Pythagorean measurement to meet all your needs. 【Rechargeable by USB】 - Built-in rechargeable lithium battery for longer life, the maximum power state can be used continuously for 5 hours, rechargeable by USB, can be recycled, save battery life and worries. 【High precision】: 40 m / 131 ft, laser measurement accuracy: +/- 3mm ， It is available for continuous measurement, the precise distance can be read in the effective range while moving ， Class II laser output lt; 1mW output power. Dust proof: Ip54, body size: 8.5 * 4.3 * 7.5cm, actual weight: 280g. Compact and powerful】 Simply turn on the switch and press the operation button to instantly measure distance accurately and operate easily. Fits in the hand, has an easy-to-read LCD screen and can be used in dark places and in the rain. The simplest professional rangefinder. Great for DIY, construction, home decoration. ect 【Other supported functions】 - 1. Manual calibration automatically adjusts laser precision. 2. Switch between front and rear references. 3. The laser turns off automatically after 30 seconds of inactivity. After 180 seconds (3 minutes) of inactivity, the screen will automatically turn off to save power. Packaging: 1x set of laser tape measure, 1 x manual, Safety Notice: 1.Please read the instruction carefully before use. Note: This does not include other things , the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you