This is the best quality  "3 WIRE"  surveilllance kit Headset  with Push-To-Talk switch. You don't need to worry about head or ear size. Clear plastic coiled ear tube delivers LOUD and crisp audio. Tube is routed behind and then hooks over the ear. Soft, silicon rubber ear bud fits all ear sizes. The plastic ear tube also reduces the conduction of harmful  radiation to the head. It features a small microphone that measures a mere 1/2 x 1/4 of an inch. Just plug it into your cellphone or home/business cordless phones for convenient hands-free talk! It design assures a comfortable fit. Push-to-Talk (PTT) switch box measures only 1/2 x 1/2 x 1/4 inches and is easily concealed in the palm of your hand. It also has a Velcro hook backing that allows it to be conveniently attached to the included Velcro strip (6x 3/4 inches unrolled). The Velcro Strip, with the PTT switch attached, may then be wrapped around your finger, like a ring, thereby eliminating the need to continually hold the PTT switch. The wire attached to the PTT button is typically hidden in your sleeve. Satisfaction Guaranteed.

Compatible with : Nextel i205, i215, i265, i275, i285, i305, i315, i325, i335, i355, i365, i415, i450, i465, i530, i560, i570, i576, i580, i605, i615, i670, i680, i710, i720, i730, i733, i736, i740, i760, i776, i830, i833, i835 Roxy, i836, i850, i855, i860 Woody/Tattoo, i870, i875, i880, i890, i920, i930, ic402, ic502, ic602, ic902 phones