Q1.Regarding heat and power consumption:
1. The DS2 does not have a built-in battery, so it will consume power from the connected device during use. Please be mindful of your device's battery life whenconnecting the DS2 to a smartphone or other devices.
2. Although compact in size, the DS2 delivers a high output power. The operational temperature rise is approximately 15-25 ℃ depending on the output powerused during operation. lt is normal for the device to feel slightly warm during use.

Q2.About playing DsD audio files:
1. When playing DSD files on Android devices, it is recommended to use applications that support DSD filedecoding(such as "HiByMusic APP"), enable dedicated USB audio access mode, set the DSD output option to DoP, and turn on exclusive mode.

2. When playing DSD files on iOS devices, it's recommended to use decoding-supported applications(such as "HiByMusic APP") and set the DSD output optionto DoP. Switching tracks with different sample rates may result in a slight POP sound, which is a normal occurrence
3. For playing DSD files on a computer, it is advised to use software that supports DSD file decoding (such as"Foobar 2000 on Windows or Audirvana on Mac")and ensure the related applications are correctly installed.(Please visit the Fosi Audio official website to download the Foobar installation package.)

03.What should be noted when connectingto the 4.4mm headphone iack?
1. Please do not use any 3.5mm to 4.4mm adapters as this may result in no sound, stuttering etc.during use.
2. lt is recommended to use 4.4mm headphones directly.

Q4.Can the DS2 be used to answer calls while connected?
The DS2 does not support call-answering capabilities while connected. Should you receive a call on your mobile phone while using the DS2 device, you will need to converse directly via your phone's speaker and microphone. The connection status of the DS2 will not interfere with the normal operation of your phone's call functions.

05.Potential issues when DS2 is connectedvia USB to various devices :
These issues may arise due to the exclusive USB audicaccess and compatibility differences across devices.Known scenarios include:
1. On certain phones or devices using specific playback software, the DS2's volume control buttons may not affect the device's volume.In such cases, please adiust the volume directly through your device.

2. Power management settings on some phones may prevent apps from running in the background, causing your music playback to stop a few seconds after the device goes to sleep. You can modify the power management settings on your device to allow music apps to run in the background.
3. Operating other applications while the DS2 is inexclusive USB audio mode may result in delays or nosound issues. We recommend focusing solely on music playback when using exclusive mode, or exiting exclusive mode to avoid these problems.