... off is a switch for power. 1) when you push the on/off to "on" position, the dress ... the frequency is slowly. this time, if you push the button switch, the flashing frequency will be rapid. but ... dress not light flash. this time , if you push the button switch, the dress will be flash. but the ... flashing just continue about 15 seconds. Replace batteries 1) push the ON/OFF to "off" position.2) loose ...