What does it mean ”if you need to get s12/s22 curve, please exchange the tx/rx port manually”? is it easy to do?

To change the TX/RX port simply unscrew the connection cable from the upper port on the NanoVNA and reconnect it to the lower port.

Will the unit be the 3.4 if i order it now?

Yes, it is 3.4 version, if you order it now

I read in description "900 mhz - enable extended firmware." what does this mean? does it cost extra?

As I understand it, you can extend the range of the device by a firmware update. But there is a resulting decrease in performance. It’s a free update if you so choose. Wayne N4EYZ

What connection type does the battery charger use?

This is an add-on to the other answers that may prevent damage. Quote from specs. on this product page: "maximum charging current 0.8A" In other words, this may get damaged if more than a 1 amp USB charger is used.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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SEESII Nanovna-H Vector Network Analyzer,Upgraded HW3.7 9KHz-1.5GHz MF HF VHF UHF Antenna Analyzer, Measuring S Parameters, Voltage Standing Wave Ratio,Phase,Delay,Smith Chart,Support Data Storage

Product ID: 171114193

💾MicroSD data storage up to 32GB

📊2.8-inch touchscreen display

📶9KHz-1.5GHz wide freq range

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C$5392

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Elevate your antenna game with precision and portability!

DATA DRIVEN DECISIONS - Built-in MicroSD slot lets you save and review field data anytime, anywhere.
BROAD SPECTRUM MASTERY - Covers MF, HF, VHF, UHF bands from 9KHz to 1.5GHz—future-proof your antenna analysis.
PRECISION MEETS PORTABILITY - Compact 2.8-inch touchscreen with upgraded HW3.7 for on-the-go pro measurements.
ADVANCED S PARAMETER ANALYSIS - Measure S11/S21, VSWR, phase, delay, and Smith charts with professional accuracy.
SEAMLESS SOFTWARE INTEGRATION - Control and visualize data via NanoVNASaver on Android and PC for effortless workflow.

The SEESII Nanovna-H Vector Network Analyzer HW3.7 is a compact, portable antenna analyzer covering 9KHz to 1.5GHz frequency range. Featuring a 2.8-inch touchscreen, advanced S-parameter measurements, and a MicroSD slot for data storage, it supports professional-grade antenna resonance, SWR, phase, delay, and Smith chart analysis. Ideal for electronics engineers, amateur radio operators, and DIY enthusiasts seeking high accuracy and versatile software control.

Specifications

ASIN	B08132DJLS
Batteries	1 Lithium Ion batteries required. (included)
Best Sellers Rank	#25,274 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Spectrum Analyzers
Date First Available	November 5, 2019
Item Weight	7.1 ounces
Item model number	NanoVNA-H
Manufacturer	Seesii
Package Dimensions	5.24 x 3.66 x 2.13 inches

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