User Manual Abergbest 20180112 - Compact Digital Camera, 8X Zoom HD 720P

Yes, it come with a wrist strap.

This camera is easy to download to your laptop, you need to check out all the specs. of this camera before you buy it, for a few dollars more you can have a camera with adjustable lens.

Hello SD card is purchased by yourself,Support external-memory max 64G SD card, SD card not included in the package box , customers need to buy certified brand SD card, we recommend that you use 32GB to 4GB, Memory Card Speed: Class 4 above，SD card needs to be formatted before using.

If your computer isn't even seeing the camera, it's probably because the "drive letter" for the camera (C, E, etc.) is already being used by another device. Try unplugging other USB devices and try again. If that doesn't work, search "how to change drive letter" on Google. It's not hard to fix.

Yes, it can take photo, also it can take videos. Need to download the videos into your computer to hear the video sound.

No, this does not support external mic. It has internal mic, camera can record vioce by istself, and you can display video on computer as there is so Speaker on the camera.