About this item One ring mono adapter, 2.5mm plug to 3.5mm Jack. Please ensure you check the number of rings on the plug you are adapting before purchasing. Works perfectly to adapt a standard sized 3.5mm IR blaster, IR Emitter Extenders, IR Repeaters, or IR Receivers to fit into the new Harmony hub (which has a 2.5mm port). If your IR blaster is 3.5mm (similar to the Android aux port size) and you want to use it with the new Harmony hub, this is the right choice for you. Package comes with 5PCS, ensuring you always have a backup at home or in the office. Size: 1.81 x 1.61 x 0.67 inches.