Mini Lntelligent Hand-held Laser Rangefinder USB Charge Aluminum Alloy Fuselage Measuring Distance: 30m/40m/50m

May I ask how the product switches between m/ft/in?Unit switching method: first, please turn off the Distance measuring equipment, let the machine be in the shutdown state, press and hold the main button (do not release the button halfway), and then release the button when the unit switches to the unit you want to switch.
Specification:
Product material: aluminum alloy + ABSProduct color: grayProduct size: 5.6*2.2*1.3cmColor box size: 10.4*4.3*2.8cmProduct net weight: 24gProduct gross weight: 50gMeasurement accuracy: ±(2.0mm+5x D )Range: 0.03~50m optionalMeasurement datum: front/rear datumMeasurement unit: m/ft/inLaser type: Class2, 630~670nm, <1mWWorking temperature: 0℃ ~40℃Battery type: 3.7V 250mAh polymer lithium battery (built-in lithium battery shipped)Charging interface: Micro USBNumber of buttons: 3Function description: continuous measurement, area, volume, Pythagorean measurementElectronic angle: optional Selling point: 1. High-precision one-piece molding process, polishing and sandblasting, comfortable hand feeling.2. Powerful, you can test words, you can test multiple times, and you can test angles.3. Small and lightweight, with a weight of 24g, there is no burden on the hand.4. High measurement accuracy, durable and strong battery life.5. It has a wide range of applications. You can think of it and use it whenever you need to measure, such as house decoration measurement, infrastructure measurement, etc. Kind tips: 1. Please do not look directly into the beam.2. Please keep it out of the reach of children.3. Do not use the instrument in flammable and explosive environments.4. Do not use this instrument near medical equipment or in the air.5. The instrument parts must be kept clean at all times, please close them before cleaning. When there is dust on the laser transmitting port and receiving lens, use a soft cloth with clean water or a neutral screen cleaner, and then wipe. Do not use acidic or alkaline detergents for cleaning; also, do not use alcohol or other solvents for cleaning6. The meter is not waterproof and cannot be wetted or placed in water. Package list: Manual + rangefinder + lanyard + data cable Laser rangefinder,Range finder,Laser measuring tape,digital tape measure,laser ruler About Your Shipment: Preparation Time: The delivery will take approximately 1 week after payment is made, and will be shipped via air express. Please ensure your address is correct when placing your order. If you need to make changes before shipment, please inform us of the updated address. Contact Us: We strive to provide excellent service. If you have any questions, please feel free to reach out to us. We will respond promptly and do our best to resolve any issues. About Guarantee: Failed to receive after 60 days of purchase date or not satisfied. We will either issue you a refund or resend a new item. Guaranteed!