These top of the line commerical GN Netcom telephone headsets are sold in two parts: Headset Tops and Amplifiers. You will need one of each! 1. Select the GN Netcom headset top of your choice. 2. Select the GN Netcom Amplifer Base that fits your telephone equiptment. 1. Pick a Headset Top Style 2. Pick an Amplifier Base (to work with your phone or computer) | Headset Tops | Headset Amps | Cordless | Cellular | Bluetooth/Computer | Accessories | E-mail us with any questions or comments about GN Netcom telephone headsets to info@headsetsbluetooth.com.