Do the btc 201 / btc 211 have battery backup or memory? if the power goes off, will they resume without me resetting it when power returns?

We own the BTC211 and can definitely confirm that it has battery backup/memory.

Is there an option for a longer temperature probe cable, or a way to extend it?

Seems like you could extend it easily as it is just a standard 3.5 mm connection. Though I have not tried it. This is an excellent reliable product!

What size screw do you use for mounting it to the wall? Must have a thin head

Just try and find screws with a <1/4" diameter head and flat, good luck, they don't specify screws by head size. WTH these don't come with any hardware, IDK.

Does this Temp controller have solid-state relays or mechanical contacts?

I'm sorry, I am not a technical person. All I can tell you is - I set the parameters on the controller to keeps my greenhouse between 62 and 66 and it does all day and all night. If the temperature goes above 66 the controller will not come on until it drops to 62.

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Temperature Controller 1650W 15A BTC211 Dual Digital Outlet Thermostat Plug, Pre-Wired, 2 Stage Heating and Cooling Mode, 110V - 240V, Fermentation BBQ Reptile Aquarium

Q: Does this Temp controller have solid-state relays or mechanical contacts?

I'm sorry, I am not a technical person. All I can tell you is - I set the parameters on the controller to keeps my greenhouse between 62 and 66 and it does all day and all night. If the temperature goes above 66 the controller will not come on until it drops to 62.

Product ID: 32710514

Details

Brand
bayite
Controller Type
PLUG AND PLAY
Model Name
BYT-3A061
Product Dimensions
2"D x 4.5"W x
Special Feature
Programmable

⚡1650W max power output

🔄2-stage heating & cooling

🌡️Dual digital temp display

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₩124329

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌡️ Master your environment with precision and ease—never miss the perfect temp again!

SAFETY FIRST - Built-in high/low temp alarms and compressor delay protect your investment.
DUAL RELAY POWER - Control heating and cooling simultaneously for precise climate mastery.
PLUG PLAY SIMPLICITY - Effortless setup with pre-wired design—get started in seconds.
REAL TIME DUAL DISPLAY - Monitor current and target temps side-by-side for instant feedback.
VERSATILE COMPATIBILITY - Works seamlessly from 110V to 240V—perfect for fermentation, BBQ, reptiles, and aquariums.

The bayite BTC211 Temperature Controller delivers professional-grade dual-stage heating and cooling control with a powerful 1650W output. Featuring a dual digital display, plug-and-play setup, and comprehensive safety alarms, it’s engineered for precision environments like fermentation, BBQ smoking, reptile habitats, and aquariums. Compatible with 110-240V systems and equipped with a 3m waterproof sensor, it ensures reliable, real-time temperature management backed by a 1-year warranty.

Specifications

ASIN	B01KMA6EAM
Additional Features	Programmable
Backlight	Yes
Best Sellers Rank	#65,741 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #78 in Temperature Controllers
Brand Name	bayite
Color	Black
Control Method	Touch
Control Type	Button Control
Controller Type	PLUG AND PLAY
Customer Reviews	4.5 4.5 out of 5 stars (1,463)
Display Type	LCD
Included Components	temperature controoler with plug and a sensor
Item Dimensions D x W x H	2"D x 4.5"W x 4.5"H
Manufacturer Part Number	BYT-BTC211
Material Type	Plastic
Model Name	BYT-3A061
Model Number	BTC211
Mounting Type	free standing
Number of Batteries	Unknown batteries required.
Power Source	Battery Powered
Product Style	Digital
Shape	Rectangular
Specific Uses For Product	Heat Pump, air conditioner, heater or cooling fan, freezer
Temperature Control Type	Heating, cooling , both heating and cooling
UPC	711463671460
Unit Count	1.0 Count
Voltage	110 Volts
Wattage	1650 watts

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TrustScore 4.5 | 7,300+ reviews

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Customer service was outstanding when I had questions about the product.

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