GM-902 Wireless Magnetic Charging Hearing Aids Elderly Sound Amplifier, (Red Blue+Black), (Skin-color+White), (Skin-color+Black)1. Material: ABS, electronic components 2. Battery capacity: hearing aid: 30mAh, charging case: 300mAh 3. Charging time: 2 3 hours 4. Use time: 35 hours 5. Built in smart chip, no delay, clearer sound 6. Smart touch design, multi level party volume can be adjusted freely 7. Ergonomic design, more comfortable to wear 8. Small size, more convenient to carry 9. Earplugs are available in different sizes 10. Product size: charging case: 6. 05 x 4 cm,