Female Tail is 20mm Long from Back of Module. Compatible with Wall Plate Module FramesDimensions: 50 x 25 200mm Weight: 13g. 50mm x 25mm clip in module with a 3.5mm stereo jack connection and 3.5mm female tail to the rear. Ideal for simple connection of headphones or speakers to an audio source in a different location without the need for trailing wires. Suitable for domestic- commercial or educational applications.. module plates