[
    {
        "role": "user",
        "content": "on%20an%20iPhone%2017%20pro%20running%20the%20latest%20iOS%2C%20how%20do%20I%20disable%20the%20phone%27s%20USB%20port%20from%20charging%20an%20external%20device%20plugged%20into%20it%3F"
    },
    {
        "role": "assistant",
        "content": "There\u2019s no built-in way on any iPhone (including newer ones like the iPhone 17 Pro) running current iOS versions to *disable the USB port\u2019s power output* so it cannot charge an external device. The port is designed to provide power continuously when plugged in \u2014 there\u2019s no software setting in iOS that turns that off independently of charging your iPhone.  \n\nHere\u2019s a more detailed breakdown:\n\n---\n\n### \ud83d\udd0c What you *can* control\n\n- **USB Restricted Mode / Wired Accessories settings**  \n  These settings are about limiting *data* access when the iPhone is locked (usually after an hour), not about stopping power flow. ([idownloadblog.com](https://www.idownloadblog.com/2018/06/14/ios-12-usb-security-restricted-mode-how-to/?utm_source=openai))  \n\n- **\u201cUSB Accessories\u201d toggle** in *Settings \u2192 Face/Touch ID & Passcode* or *Settings \u2192 Privacy & Security \u2192 Wired Accessories*  \n  This controls whether accessories can communicate via USB when the phone is locked, or whether you need to unlock first. It does *not* prevent external devices from drawing power through the port. ([support.apple.com](https://support.apple.com/en-us/111806?utm_source=openai))  \n\n---\n\n### \u2699\ufe0f Why stopping power flow isn\u2019t supported\n\n- The port\u2019s hardware is designed to act as a power source when external devices are connected under certain circumstances (especially with USB-C models), and iOS provides security limits for data\u2014not power.  \n- If power flow were controlled, it could affect important functionality, such as connecting accessories, charging other devices, or using power sharing (in devices that support reverse-charge). None of these are individual toggles in iOS.  \n\n---\n\n### \ud83d\udd27 What you *could* do instead\n\nIf you need to prevent an external device from charging off your iPhone\u2019s port, consider these hardware workarounds:\n\n1. **Use a \u201ccharge-only\u201d cable / USB data blocker**  \n   Some cables or adapters only carry power and no data. While this doesn\u2019t stop the phone supplying power *if that's how it's wired*, many blocks are designed to block *data*, not power. But a specialized dongle could physically remove power lines, depending on design.\n\n2. **Physically disconnect or block the connection**  \n   If the device is connected via, say, USB-C and physically expects to draw power, you might have to use a cable or adapter that removes or cuts the power wire. This usually isn\u2019t practical and requires specialized parts or DIY mods.\n\n3. **Use external powered adapter or hub**  \n   If the external device is plugged into an adapter that supplies its own power, you might avoid drawing from the iPhone, depending on how the setup is wired\u2014but this depends completely on the hardware.\n\n---\n\nIf you'd like, I can look up whether there are any third-party devices or accessories specifically made for newer iPhones that stop power output on USB-C. Do you want me to check?"
    },
    {
        "role": "user",
        "content": "i%20have%20a%20bryston%203B%20pre-amp.%20what%20kind%20of%20battery%20does%20the%20remote%20control%20require%3F"
    },
    {
        "role": "assistant",
        "content": "I couldn\u2019t find a definitive source specifically for a \u201cBryston 3B pre-amp\u201d remote\u2019s battery type, but I found helpful info from similar Bryston models which likely use the same remote or battery type. Here\u2019s what I found:\n\n---\n\n### \ud83d\udd0e What I Discovered\n\n- Bryston\u2019s BR2 remote control (used with several Bryston preamps, integrated amps, and digital players) is powered by **two AAA batteries**. ([manualzz.com](https://manualzz.com/doc/1526986/owner-s-manual?utm_source=openai))  \n- To replace the batteries in the BR2 remote, you remove the bottom cover via four Phillips screws to access the battery compartment. ([manualzz.com](https://manualzz.com/doc/1526986/owner-s-manual?utm_source=openai))  \n- Another remote from Bryston, the BR5 (used with more recent/preamp models), uses a **rechargeable battery** that charges via USB-C. ([manuals.plus](https://manuals.plus/m/776e5a3feff88f73b42b57c2ff112d4642182411c0e737cfe9239315a654dc32?utm_source=openai))  \n\n---\n\n### \u2699\ufe0f What to Check for *Your Remote*\n\nTo be sure, here\u2019s what you can do:\n\n1. **Take a quick look at the back of the remote**  \n   Often the battery type (e.g., \u201cRequires 2 \u00d7 AAA\u201d) will be stamped or printed on the battery cover.\n\n2. **Remove the bottom cover**  \n   If it\u2019s held by screws, removing them will reveal the battery compartment\u2014see how many battery slots there are, and what size (compare to AAA / AA etc.).\n\n3. **Check shape and size of battery compartment**  \n   \u2022 If it fits *two slim elongated batteries*, they are likely AAA.  \n   \u2022 If the compartment is a single block, it might be a rechargeable pack, especially if there\u2019s a USB-C port visible.\n\n4. **See if there\u2019s a USB-C port**  \n   If it\u2019s a newer Br5 remote (or similar), there\u2019s a USB-C charging port, which implies a built-in rechargeable battery. ([manuals.plus](https://manuals.plus/m/776e5a3feff88f73b42b57c2ff112d4642182411c0e737cfe9239315a654dc32?utm_source=openai))\n\n---\n\n### \u2705 Most Likely Scenarios for Your 3B Preamplifier Remote\n\nGiven that your pre-amp is a more \u201cclassic\u201d Bryston model, it\u2019s most likely matched with the BR2 remote. If that\u2019s the case:\n\n- The remote likely uses **2 \u00d7 AAA batteries**, non-rechargeable.  \n- If you find it has a USB-C port or looks physically like a newer BR5 remote, then it likely has a rechargeable battery.  \n\n---\n\nIf you like, I can track down a scanned manual or specs specifically for your 3B preamp remote to be 100% sure. Want me to pull that up?"
    }
]