To turn the hearing aid on, close the battery cover and push it up-wards. The hearing aid will play a sound signal to indicate that it is on, unless your hearing care professional has deactivated this function. To turn off the hearing aid, push the battery cover downwards. You can also cup the hearing aid in your hand to verify that it is turned on. If it's on, it will whistle. Don't forget to turn off the hearing aid when it is not in use. Specific instructions may vary depending on the exact model of your hearing aid. Consult manual or give us a call if in doubt.