Depress the in-line PTT button and speak into the headset microphone.
Earpieces are appropriate in noisy environments or when additional privacy is wanted.
They are available with or without volume control. The earpiece is accompanied with a microphone so you needn't take the radio off the belt to use. Just press the PTT on the lapel mic. Chargers all have a light indicating that a charge is in progress. Standard Chargers provide a 10-hour charge.