The Rollei Actioncam 4S Plus may not be working due to a variety of reasons such as a drained battery, faulty memory card, or a software glitch. It is also possible that the camera is not properly turned on or there may be a hardware issue. Troubleshooting steps such as checking the battery level, formatting the memory card, and updating the camera's firmware may help resolve the issue. If the problem persists, contacting Rollei customer support for further assistance may be necessary. **

There could be several reasons why there is no sound on the Rollei Actioncam 416. First, check if the microphone is turned on and not muted. Also, make sure that the camera's settings are configured to record audio. If the issue persists, it could be a hardware problem with the microphone or the camera itself, in which case it may need to be inspected or repaired by a professional. **

The Rollei Actioncam 372 is compatible with microSD memory cards. It is recommended to use a microSD card with a Class 10 speed rating for optimal performance, especially when recording high-definition video. Additionally, the camera supports microSD cards with a capacity of up to 64GB, allowing for ample storage space for capturing all your adventures. **

Yes, the memory card is compatible with the Rollei Actioncam 372. The Rollei Actioncam 372 supports microSD memory cards, and the memory card in question is a microSD card. Therefore, it should work seamlessly with the camera to store photos and videos. It's important to ensure that the memory card meets the camera's specifications for capacity and speed to ensure optimal performance. **

To attach the Rollei Actioncam to a helmet, you can use the adhesive mount that comes with the camera. First, clean the surface of the helmet where you want to attach the mount. Then, peel off the backing of the adhesive mount and firmly press it onto the helmet. Once the mount is securely attached, you can then use the camera's mounting system to attach the Actioncam to the mount on the helmet. Make sure to double-check that the camera is securely attached before using it to ensure it doesn't come loose during activities. **

To delete files on the Rollei Actioncam 372, you can connect the camera to a computer using a USB cable and access the camera's storage. From there, you can navigate to the folder containing the files you want to delete and simply select and delete them as you would with any other files on your computer. Alternatively, you can also use the camera's built-in menu system to navigate to the files you want to delete and use the camera's controls to delete them directly from the device. **

The Rollei Actioncam 425 has a fixed aperture of f/2.8 and a fixed focal length of 2.4mm. It offers a wide-angle field of view of 170 degrees. The camera has various exposure settings including automatic exposure control, manual white balance, and exposure compensation. Additionally, it has a range of ISO settings from 100 to 1600 for different lighting conditions. **

The Sony ActionCam may deliver poor recording despite having 4K resolution due to several factors. One possible reason could be the quality of the lens and sensor, which may not be able to capture and process high-resolution images effectively. Additionally, the camera's image stabilization and processing capabilities may not be advanced enough to handle the high-resolution footage, resulting in shaky or blurry recordings. Lastly, the overall build and design of the camera may not be optimized for capturing high-quality video, leading to poor recording despite the 4K resolution. **