V30 is a rechargeable ITC hearing aid, professional auditory and acoustic design, high- quality components, bringing clear and natural listening enjoyment, rechargeable and portable charging boxes very easy to use. V30 is a simple, convenient, high-quality and clear and natural sound quality. Audiological Features： ·Low Equivalent Input Noise ·Super Clear Sound ·Low Frequency Cut Filter Functional Features： ·Integrated signal processing ·Balanced Armature Receiver ·MEMS Mic ·Volume Control Mode: Rotated VC 0~Max. ·Rechargeable lithium-ion battery ·Charging time: 3.5 hours ·Battery life: 25 hours per full charge ·Standby time:1year Note 1.Adjust volume to the minimum before wearing. 2.Choose an earplug of slightly bigger size to avoid whistler. 3.Increase volume gradually to avoid sudden increase in sound. 4.If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage. If it still does not work, please check the chat window leave me a message. 5.Keep the ear plug clean. 6.Remove the battery if you don't use it for long time. ● Colors available：Red, Blue ● Type: Blue for Left, Red for Right (1Pair)