Infrared Thermometer - Fast measurement in just 1 second. Supports surface and room temperature measurement. Purchased in the USA. Operation confirmed. No instruction manual, but the instructions written on the main unit are listed below. One of the battery compartment holes (on the lid side) is slightly tight, and it may be difficult to remove the battery in some cases. Batteries will be removed before shipping. The screen protector has not been peeled off yet. Selling because I have no use for it. 【Settings】 Short press Key 1: Temperature unit switching Short press Key 2: Sound ON/OFF Short press Key 3: Memory check, then long press for 3 seconds ↓ F-1: Temperature correction setting F-2: Fever alarm F-3: Celsius/Fahrenheit switching F-4: Backlight ON/OFF F-5: Laser ON/OFF - Type: Non-contact - Function: Temperature measurement - Power: 2 AA batteries - Display: Digital display There are no noticeable scratches or stains, but please refrain from purchasing if you are concerned about minor imperfections.