What is the fine-grained topic of the following text: Approved under the ATEX directive with certification code EEX ib IIC T4.The main features include H540 cups, integrated microphone boom with Quick Positioning for easy handling, ATEX approved, fluid-filled ear cushions and beam-mounted earphones.Models: With folding leather headband - MT72H540F-50, With helmet attachment - MT72H540P3E-50. Only return the topic.
ATEX approved headset models with specific features