Yes, the helmet action camera supports underwater recording up to 20m/66ft, ideal for free diving, snorkeling, swimming, etc

Yes, it picks up sounds and filters the background noise.

Dear customer: Hi! This time-lapse camera takes photos or short videos at set time intervals and automatically combines them into a long video to record interesting things in your life. If you like to observe changes in animals, plants and the environment, such as the growth of plants and the blooming of flowers, you need to record something; the development of things, such as the process of building a house, the process of making handicraft, and so on. Hope our answers are helpful to you and wish you a happy life! Dsoon

Lithium batteries are the best option for trail cameras as they last longer and perform better in extreme temperatures.

Make sure the SD card is not full. If the card is full, the camera will stop taking pictures; make sure the battery is fully charged; make sure the camera mode switch is slid to the "ON" position; please format the SD card with the camera before use or when the camera stops taking pictures.