This is our new medium-sized wire-through case. Ideal for radio mics that won't fit in the smaller 158. Use all buttons and switches through the case, feed out a wire of up to 2.5mm diameter from the case. The seams are high-frequency welded to form a super-strong bond. Waterproofness Warning!: This case features our 'TC' Aquaclip which makes the case waterproof to IPX7. Temporary immersion is fine, but not continuous immersion.