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

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

🔔3-color fever alert + warning sound

🌡️1-second instant reading

€ 45.03

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Description

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

SMART ALERTS - Dynamic 3-color backlit display with audible fever alarm keeps you instantly informed.
VERSATILE USE - Measures body, room, objects, and liquids—one device for all your temperature needs.
SAFE HYGIENIC - Non-contact measurement prevents cross-infection—perfect for families and shared spaces.
INSTANT PRECISION - Advanced infrared sensor delivers ultra-fast, ±0.2℃ accurate readings in just 1 second.
USER FRIENDLY DESIGN - Large LCD, auto shut-off, °F/℃ switch, and memory recall for effortless daily monitoring.

This FDA-approved digital thermometer uses cutting-edge infrared technology to provide ultra-fast, highly accurate temperature readings without physical contact. Designed for all ages, it features a 3-color fever alert system, audible warnings, and versatile modes for body and surface temperatures. Lightweight and easy to use, it’s the smart, hygienic choice for modern families and professionals seeking reliable health monitoring.

Specifications

ASIN	B08HWBWD4S
Additional Features	Alarm, Backlit, Fast Reading System, High Accuracy, Non-Contact
Age Range Description	Adult; Kid
Best Sellers Rank	#1,373 in Baby ( See Top 100 in Baby ) #14 in Baby Thermometers
Brand Name	hetaida
Color	Purple
Connectivity Technology	Infrared
Customer Reviews	4.6 4.6 out of 5 stars (8,131)
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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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

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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TrustScore 4.5 | 7,300+ reviews

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Very impressed with the quality and fast delivery. Will shop here again.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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€ 45.03

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered 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 Slovakia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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I loved the variety of products available. Will definitely shop again.

2 months ago

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Fantastic and great service. Shipping was faster than expected.

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