How to use the hearing aid?
1. Dial the "OFF-N-H" switch to "N" and adjust thevolume to get the clear sound.
2. When in noise places, you can dial the "OFF-N-H"switch to "H" to reduce the noise of low frequency
How to charge the hearing aid?
1. When the sound of the hearing aid is very small andthe hearing aid does not work, the hearing aid mightwith low battery, please charge the hearing aid intime.
2. Turn off the hearing aid when charge, and insert oneend of the USB 5V/S0mA charger into the
hearing aid.3. Plug the charger into power outlet.4. The new hearing aid should be charged for 4 hoursfor first few times you use, for second time it's bettercharge after running out of the battery, so necessaryafter three consecutive cycles, the battery is easy toachieve the best condition.

Things to Remember(Cautions)
1. If you feel whistling sound, please make sure if youput the earplug tightly, or if you use a appropriatesize earplug
2. Please don't use the hearing aid at a high volume fora long time,it will damage your hearing.3. Please maintain the product all the time in order toavoid the earplug and microphone opening beingblocked by foreign objects.4.Please don't use when showering, swimming,raining or wet environment, please don't expose thehearing aid under sunshine, get close to a stove orother heat sources.
5. Please protect the hearing aid carefully and avoiddropping it on the floor.
6. Keep the hearing aid away from the children.