Headsets are listed in alphabetical order. Date Codes consist of one letter and one number (e.g., A9).BackBeat 903/906 The two digit Date Code on this headband is located on the left side, which also has the on/off switch. Look at the inside surface (facing your ear) and you will see a printed "CE". Above the CE are four lines of very small print. The Date Code is on the third line.
BackBeat 903+ NOTE: In the example below, the Date Code is the letter I and the number 0.
Discovery 600 Series (610, 640, 640E, 645, 655, and 665)Discovery 925/975Explorer 210, 220, 230, 320, 330, 340, 350, and 390Explorer 360/370M100M1100M2500M3000/M3500Pulsar 260Pulsar 590A/590EPulsar Universal AdapterVoyager 510/510sVoyager 815/855Voyager 835Voyager Pro/Voyager Pro +