White Noise Machine Sound Machine for Sleeping & Relaxation Portable Home,Office or Travel FEATURES -This machine helps to provide you with a soothing sleep environment, it masks disruptive environmental noises so that it can help you get better sleep and stress relief. It can also improve your concentration while you read ,work or study. -Nine relaxation sounds: Ocean, Thunder, Soothing music, White noise, Wind, Brook, Summer night, Rain, Bird. -An auto-timer:Limiting the sound playing time to 15,30 or 60 minutes. -A volume control knob :Adjusting the volume of the sound. -Compact and lightweight for traveling. USAGE -This unit is powered by an adaptor(not included),or four AA size batteries(not included). -Attach the AC adaptor jack to the base of the unit and insert the plug end of the adaptor into a 120/220V household outlet. -To install batteries, remove the battery compartment cover and insert four AA size batteries into the compartment on the bottom of the unit according to the polarity directions indicated. -To turn on the unit, turn the VOLUME knob clockwise. The green Power LED will light up to indicate the unit is on. -To choose one of the nine sounds by pressing the corresponding button once. -To adjust the volume, turn the volume knob. -To set a timer, press the timer button to choose the sound playing time 15,30 or 60 minutes. (note: Do not press the timer button if you wish to listen the sound continuously) -To turn off the unit, turn the knob to the OFF position. CAUTION-please read all instructions carefully before operating: -Always keep the unit away from water, high temperature and fire. -Never operate this unit if it has a damaged cord, plug, cable or housing. -Always unplug the unit from the electrical outlet immediately after using and before cleaning. -To clear the unit, gently wipe with a soft cloth, moistened with warm water or mild detergents, and then remove all the moisture with a soft, dry cloth. Do not useharsh solvents or chemicals for cleaning. BATTERY PRECAUTIONS: -Use AA size batteries only . -When installing batteries, observe proper +/- polarities, incorrect installation of batteries may cause damage to the unit. -Do not mix alkaline, standard(carbon-zinc), or rechargeable batteries. -Remove used batteries promptly. -If the unit is not going to be used for a long time, remove batteries to prevent damage due to possible battery leakage. -Please remove batteries when using the USB to power the unit. PRODUCT WARRANTY 1.Warranty is available free of charge for 12 months from the date of purchase. 2.The warranty does not include any of the following circumstance : Which is caused by customer from normal daily use, storage, and maintenance. Please read the instructions and caution carefully before operating. PARAMETERS Model No.: UNM-GH-006 (Standard) UNM-GH-006U(Upgrade) Input: U=5V, I