product description： RECHARGEABLE - Rechargeable, with a portable, magnetic charging station. The built-in high performance Li-on battery enables each charge to last 20 hours for use. PORTABLE CHARGING CASE - The charger has it's own battery which allows you to charge the device on the go. It will provide an additional 3 times to recharge before needing to reconnect to a power source. Support wireless charger. 1.8 Channels &12 Bands 2.Intelligent Noise Reduction System(18 DB) 3.Automatic Feedback Compression DFS System 4.Program Switch Beep 5.Secondary Strong Sound Block 6.Multi-channel Expansion(8 Channels) 7.Three Programs /3 scene switching 8.Intelligent Frequency Spectrum Analysis System 9.Intelligent Volume Learning 10.Program/Volume Recording 11.Soft Shutdown 12.8 Channel Maximum Output Control 13. Pre-programmed Type(best fitting based on the audiogram) 14.Level 4 Intermediate Wind Noise Suppression Management System

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