Anyone know what the "charging off" switch is for? Why would I turn the charging ability off? The unit plays music fine with it off or on?

1) you need to switch it on to charge the unit. 2) you can set it to off to prevent it drains battery of your phone when you connect it (via usb-c not bluetooth) to your phone. 3) the unit plays music fine regardless of this switch's setting. hope it helps.

For those on ios (iphone or ipad), are you able to save your 3 custom eq settings on to btr7 from fiio control? heard there was a bug.

This is bad advice. The app is extremely easy to use and the parametric equalizer is perhaps the best feature and the reason I purchased this amp. I use iOS and saving the settings is easy and practically automatic. The custom EQ is only adjustable through the app. I’m not sure why so many people have problems using it. It seems so simple to me. My only issue is when you reset the custom EQ to default (flat), it resets all 3 at once. It would be better if you could individually reset each one.

Can this be charged while in use?

Sure can. This little amp is amazing!

Will this product increase the frequency range of my headphones? currently 20-40,000 khz, will this get it down to 10khz and improve dynamics qualiy

Your headphones' current range is 20hz to 40,000 Hz or 20hz to 40 kHz. It is already past 10 kHz, and will not reduce it. What this device will do is improve sound quality with less background noise, or hiss and so more dynamic range.

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Description

🎶 Elevate your sound game — don’t just listen, experience every note!

POWER MEETS PRECISION - THX AAA amplifier delivers up to 300mW balanced output, driving your headphones with clean, distortion-free power.
SEAMLESS CONNECTIVITY - Supports Bluetooth 5.1 with aptX HD, LDAC, and USB-C input for flawless high-res streaming on all your devices.
FREEDOM TO PLAY ALL DAY - Up to 9 hours of continuous playback with fast 1.5-hour USB-C charging and convenient Qi wireless charging.
MASTER YOUR AUDIO UNIVERSE - Experience studio-grade MQA and DSD256 decoding for audiophile-level clarity anywhere.
INTUITIVE CONTROL AT A GLANCE - 1.3” IPS color display shows bitrate, volume, and codec info, keeping you in command of your sound.

The FiiO BTR7 is a premium portable headphone amplifier and Bluetooth DAC featuring dual ESS9219 SABRE DACs, THX AAA amplifier technology, and support for high-resolution audio formats including MQA and DSD256. It offers versatile connectivity with Bluetooth 5.1, USB-C input, and balanced outputs, complemented by a vibrant 1.3-inch IPS display and up to 9 hours of battery life with wireless charging. Designed for discerning audiophiles and professionals, it delivers studio-quality sound on the go.

Specifications

Brand	FiiO
Manufacturer	FiiO
Model number	SFNS2031
Colour	Black
Number of Memory Sticks	1
Special Feature	High-Resolution Bluetooth, MQA Support, High-Performance DAC
Speaker Surround Sound Channel Configuration	2.0
Item Weight	45 g
Product Dimensions	3.96 x 1.46 x 8.3 cm; 45 g
Batteries	1 Lithium Polymer batteries required. (included)
Item model number	SFNS2031
Item Height	8.3 Centimeters
Item Width	14.6 Millimeters
Number of Channels	2
Channels	Stereo
Connectivity Technology	USB
Number of pins	8
Output Wattage	0.32 Watts
Compatible Device	Smartphone, Personal Computer, Tablet, Television
Included Components	Leatherette case \| USB charging cable \| USB Type-C to Type-C cable
Are batteries included?	Yes
Lithium battery energy content	1 Watt Hours
Lithium Battery Packaging	Batteries contained in equipment
Lithium battery weight	3 Grams
Number of lithium ion cells	1
Number of lithium metal cells	1

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