Style1 Features: Brand New,High Quality USB rechargable,Durable and reliable for long time usemini new design for portability,more comfortable. Anti-shock& anti-drop,user-friendly design Weight le than 10 gram,light weight,and the compact structure fits for put into your pocket and carry around with you. Adjust volume as your wishes Durable.Small working current and long duration of use Accurate and easy to use. Reduce noice, provides good sound quality.Help you hear the sound clearly and loudly, whether indoors or outdoors Specifications: Max sound output: 1194dB Total Harmonic Wave Distortion: 7% Frequency range: 400-4000Hz Input noise: 29DB+3 Package Included: 2 x Hearing aid 1 x Case 1 x User Manual Style2 Working Conditic a) The Environment Temperrature: -10~40R b) Relative Humidity No More Than 80% c)Atmospheric Preure 86kPa~106kPa d) Operating Voltage: DC 3.7V Product Information 1. Max OSPL90: 118+3dB 2. Average OSPL90: 1134dB 3. Maximum Sound Gain: 35+5dB 4. Equivalent Input Noise: 29+3dB 5. Total Harmonic Distortion: 5% 6. Freauencv Response: 300Hz~5000Hz 7. Battery: Lithium polymer battery DC 3.7V 8. Single Hearing Amplifier Net Weight: 3.65g Feature 1. Connecct the portable charging bank with adapter/power bark by Type-C cable.When it is being charged, the LED display screen will light up. When the LED display 100%, the portable charging bank will be fully chargged. 2. the portable charging bank takes 2-3 hours to charge, it can charge hearing amplifier 5 times. 3.There are 5 levels of sound, fingerprint touch contral the volume up or down. Acceories and Package: 1.Heariing Amplifier: 2pc 2. Portable Charging Barnk: 1pc 3. Earpllugs: 6pcs (Size:S*2,M*2,L*2) 4.Type-C Cable: 1pc 5. Clearhing Brush: 1pc 6. User Manual: 1pc