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 no-touch range

⏱️1-second instant read

🌡️±0.2°C precision

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Description

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

SAFE HYGIENIC - Non-contact measurement prevents cross-contamination, keeping your family and workspace germ-free.
PRECISION AT A GLANCE - Advanced infrared sensor delivers ultra-accurate temperature readings within ±0.2°C, ensuring you never miss a fever.
SPEED THAT SAVES TIME - Get instant results in just 1 second—perfect for busy parents and professionals on the go.
SMART ALERTS DISPLAY - Color-coded backlit LCD and fever alarm provide immediate visual and audio warnings for quick action.
VERSATILE FOR ALL AGES USES - Switch easily between body, room, and object temperature modes—ideal for babies, adults, and everything in between.

This FDA-approved digital infrared thermometer offers ultra-fast, non-contact temperature readings with ±0.2°C accuracy. Featuring a large color-coded backlit display and fever alarm, it’s designed for all ages and multiple uses—from forehead to room temperature. Compact, hygienic, and battery-powered, it’s the smart health essential for modern families and professionals.

Specifications

ASIN	B08HWBWD4S
Additional Features	Alarm, Backlit, Fast Reading System, High Accuracy, Non-Contact
Age Range Description	Adult; Kid
Best Sellers Rank	#1,654 in Baby ( See Top 100 in Baby ) #13 in Baby Thermometers
Brand Name	hetaida
Color	Purple
Connectivity Technology	Infrared
Customer Reviews	4.6 4.6 out of 5 stars (8,034)
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 °F
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
Specification Met	FDA
Style Name	Classic
UPC	193674503271
Unit Count	1 Count
Upper Temperature Range	109 °F
Warranty Description	1 Year

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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29793CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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