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 support

📊2.8-inch touchscreen display

📶9KHz-1.5GHz wide freq range

S$109

Duties & taxes included

In stock

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Description

📡 Unlock pro antenna insights anytime, anywhere with the sleek SEESII NanoVNA-H!

PLUG PLAY VERSATILITY - Includes all essential SMA cables, calibration kit, and USB-C connectivity for instant setup and control via Android/PC
SEAMLESS DATA MANAGEMENT - Built-in MicroSD slot and customizable timestamp keep your field data organized and accessible
PRECISION MEETS PORTABILITY - Compact 7.1 oz design fits your on-the-go tech lifestyle
NEXT GEN FREQUENCY ALGORITHM - Enhanced si5351 chipset delivers up to 1.5GHz accuracy with metal shielding for interference-free readings
COMPREHENSIVE ANTENNA ANALYSIS - Measures S-parameters, SWR, phase, delay, and Smith charts for pro-level diagnostics

The SEESII NanoVNA-H HW3.7 is a cutting-edge vector network analyzer designed for electronics engineers and radio enthusiasts. Covering a broad frequency range from 9KHz to 1.5GHz, it features a vibrant 2.8-inch touchscreen, advanced frequency algorithm with metal shielding for enhanced accuracy, and supports comprehensive antenna measurements including S-parameters and Smith charts. Its compact, lightweight design is complemented by a MicroSD card slot for data storage and versatile connectivity options, making it an indispensable tool for precise antenna diagnostics and field testing.

Specifications

ASIN	B08132DJLS
Batteries	1 Lithium Ion batteries required. (included)
Best Sellers Rank	#41,486 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10 in Spectrum Analyzers
Date First Available	November 5, 2019
Item Weight	7.1 ounces
Item model number	NanoVNA-H
Manufacturer	Seesii
Package Dimensions	4.96 x 3.98 x 2.13 inches

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