Siren Party Prank .  Unscrew the lid, remove the circuit, install a 23A 12v battery (not included). The battery holder is difficult because it holds the battery tightly. Place the negative end of the battery into the open area near the positive end of the holder and slide the negative end toward the spring at the negative end of the holder while pushing down on the battery positive end.) Replace the circuit into the container. Screw on the lid. Place the jar somewhere conspicuous with the sensor facing outward. Install a CR2032 coin cell battery in the remote (battery not included). When you want the siren to scream, press the button on the remote while pointing it at the jar and the siren screams. Press the remote button again and the alarm is silent. Have fun!!!!!!!!!!