what is the output frequency?is it usa 65 hz?

This I purchased in india where supply frequency is 50hz. The output frequency will be same as input frequency. So this depends on in which country you are using this equipment

I have a yamaha av receiver - ac 120 v, 60 hz with 400w and max power consumption- 590w, which one is recommended 500w/750w/1000w

You can use our model VC-1000, it's 1000W capacity, while, we suggest to use less than 800W for continous working, as if full loading or over-loading, the transformer will be easy to get hot after long time working and shorten life span.

I have an Onkyo stereo amplifier rated for 180 watt and 60 Hz and needs input voltage of 120 v. Will the 400 watt model be suitable for the purpose?

UMI 800W Step Down Converter 220V to 110V Voltage Transformer for US Appliances Used in India is works well. Rather than any other product for Converter 220V to 110V Voltage

I have brought one coffee maker and avent baby bottle sterilizer both are 120 v - 650 w - 60 hertz. will this or the lesser version one will support?

You need this model for your coffee maker.

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Step Down Transformer

Product ID: 137569855

Details

Brand
UMI
Item Weight
4 Kilograms
Mounting Type
Wall Mount
Number of Items
1
Power Source
ac

⚡1000W max power output

🔌Dual 110V outlets for simultaneous use

🛡️CE & CQC certified multi-layer safety

7375 Kč

Duties & taxes included

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Sold byAmazon Czech RepublicDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌍 Power your global lifestyle with confidence and style!

CERTIFIED RELIABLE - CE & CQC certified with a 3-year warranty—engineered for durability and consistent performance.
SAFETY YOU CAN TRUST - Built-in microcomputer control with over-current, thermal, fuse, and short circuit protections for peace of mind.
DOUBLE THE CONVENIENCE - Two 110V outlets let you power multiple devices simultaneously—just keep total load under 800W.
POWER YOUR US DEVICES ANYWHERE - Step down 220V-240V to 110V-120V effortlessly for seamless appliance compatibility.
SLIM LIGHTWEIGHT TRAVEL READY - Compact toroidal transformer design (6x17.5x22cm, 4kg) fits perfectly in your travel kit without bulk.

The UMI 1000W Step Down Converter transforms 220V-240V power sources into 110V-120V output, enabling US appliances to operate safely in India. Featuring a compact toroidal transformer design, dual 110V outlets, and comprehensive safety certifications (CE & CQC), it supports up to 800W total load with advanced microcomputer protections. Lightweight and travel-friendly, it comes with a 3-year warranty, making it an essential companion for professionals bridging continents.

Specifications

ASIN	B073TYJVWG
Best Sellers Rank	#8,386 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #12 in Power Transformers (Industrial & Scientific)
Brand Name	UMI
Country of Origin	China
Customer Reviews	4.1 4.1 out of 5 stars (48)
Included Components	Manual
Item Weight	4 Kilograms
Manufacturer	NICORE
Maximum Frequency	60 Hz
Minimum Frequency	60 Hz
Mounting Type	Wall Mount
Number of Items	1
Number of Packs	1
Power Source Type	ac
Unit Count	1 Count
Warranty Description	3 years warranty for parts

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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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7375 Kč

Duties & taxes included

In stock

Sold byAmazon Czech RepublicDelivered 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 Czech Republic.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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