Motorola Original BDN6648: Heavy Duty Headset includes noise-canceling boom microphone and can be worn with or without a hardhat. The Push-To-Talk switch is located on the ear cup. The VOX module is contained within the headset on voice activated units. Noise reduction = 24dB. This part fits the following radio models and does NOT require an adapter when used with one of these radio models. Fits: PR400, P200, CP200, CP150, P1225 (LS Version)