how to install batteries? On the bottom is a hatch door thing with an arrow...I cannot get it off...and batteries are included with mine

There is an arrow on the lid. Push horizontally in the direction of the arrow. It will move just a little, then gently lift the lid up from the edge near the end of the arrow. The lid has a hinge on the opposite end so the lid will not come off completely. Battery orientation is confusing as well as there are no molded in -/+ signs. The aaa battery near the cover hinge should have the + end facing the cover. The battery above this should have the - on top. Hope this helps.

is the default F or C?

The default of Hetaida No Contact Infrared Thermometer is ℉, it is FDA approved. And thermometer can be switched easily between ℉ and ℃.

On amazon, i see a lot of forehead thermometers of the same 8813c, are these genuine? which brand is better?

I am not sure. I just bought this on and it is good. none are as accurate as an oral. Be sure to put lithium batteries in it or it will not work.

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Digital Thermometer for Adults and Kids, No Touch Forehead Thermometer for Baby, 2 in 1 Body Surface Mode Infrared Thermometer with Fever Alarm and Instant Accuracy Readings

Product ID: 233290703

Details

Age Range (Description)
Adult; Kid
Brand
hetaida
Color
Purple
Connectivity Technology
Infrared
Display Type
Digital
Included Components
1* Thermometer

📏2-3.15 inch non-contact range

⏱️1-second instant reading

🌡️±0.2°C accuracy

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฿2233

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌡️ Stay ahead of the fever curve with instant, no-touch precision!

SMART ALERTS - Color-coded backlit LCD and fever alarm instantly notify you of abnormal temperatures.
SAFE HYGIENIC - Non-contact measurement prevents cross-infection, perfect for families and shared environments.
READY WHEN YOU ARE - Includes batteries, quick start guide, and backed by 12-month replacement plus 24/7 customer support.
PRECISION AT A GLANCE - Advanced infrared sensor delivers ultra-accurate temperature readings within ±0.2°C in just 1 second.
VERSATILE USER FRIENDLY - Switch easily between °F/°C and measure body, room, object, or liquid temperatures for all ages.

The hetaida HTD8813C Digital Thermometer combines cutting-edge infrared technology with a non-contact design to provide ultra-fast, highly accurate temperature readings within ±0.2°C. Featuring a large color-coded backlit display and fever alarm, it ensures quick detection of abnormal temperatures for all ages. Its versatile 2-in-1 mode measures body, room, object, and liquid temperatures, making it an essential hygienic tool for families, schools, and healthcare settings. Ready to use out of the box with included batteries and supported by a 12-month warranty and responsive customer service.

Specifications

ASIN	B08HWBWD4S
Additional Features	Alarm, Backlit, Fast Reading System, High Accuracy, Non-Contact
Age Range Description	Adult; Kid
Best Sellers Rank	#1,546 in Baby ( See Top 100 in Baby ) #12 in Baby Thermometers
Brand Name	hetaida
Color	Purple
Connectivity Technology	Infrared
Customer Reviews	4.6 4.6 out of 5 stars (7,924)
Display Type	Digital
Included Components	1* Thermometer, 2* AAA Battery, 1* Instruction Manual, 1* Quick Start Guide
Indoor Outdoor Usage	Indoor
Item Length	5.34 Inches
LowerTemperature Range	93 Degrees Fahrenheit
Manufacturer	htd
Model	HTD8813C
Model Name	HTD8813
Number of Batteries	2 AAA batteries required. (included)
Outer Material	Plastic
Part Number	HTD8813
Power Source	Battery Powered
Product Care Instructions	Wipe Clean
Resolution	8K
Response Time	1 seconds
Reusability	Reusable
Smart Home Compatibility	Not Smart Home Compatible
Specification Met	FDA
Style Name	Classic
UPC	193674503271
Unit Count	1.0 Count
Upper Temperature Range	109 Degrees Fahrenheit
Warranty Description	1 Year

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