I don't know what they were called. There were two types of sound-effects keyring. They were both small plastic boxes that could fit in the palm of your hand and the first type had 6 small grey buttons on one side and the other type had 12 of these buttons. Each button emmitted a different type of sound effect, ranging from the sound of machine-gun fire, to sirens, strange alienesque wails, crackling sound effects and more that i can't remember. On the opposite side to the button was a small speaker which the sound came from. I remember these items were very popular towards the end of the 80s, and every kid wanted one badly.