The product adopts a backpack-style design, which has an elegant appearance and is easy to carry. Built-in battery and integrated design make operation more convenient. The single-channel switch control product adopts a backpack-style design, which has an elegant appearance and is easy to carry. Built-in battery and integrated design make operation more convenient. Single-channel switch control...The product adopts a backpack design, which has a grand appearance and is easy to carry. Built-in battery and integrated design make operation more convenient. Single switch control...