ASHIDAVOX Noise Silencer Headphones ST-7000NS These are active noise-canceling headphones for professional use, filming, and work. 【Condition】 ・Power lamp lights up when batteries are inserted (tested). ・Sound output is possible. ・Scratchy noise occurs when touching the POWER switch. ・Noise cancellation function: Effectiveness and stability are not guaranteed. ・Due to the age of the equipment, there are scratches, marks, dirt, and signs of use. Due to the above reasons, this item is sold as-is / junk. Batteries are not included, please prepare them yourself. A stereo mini-to-TRS phone conversion plug is also included (see image 8). Please understand the above contents before purchasing.