Sleep Learning Drum Noise-canceling Headphones $ 8.77 Product Information: Material: ABS Sponge Noise Reduction Rate: 27 Function: Sound Insulation Scope of Use: Home Travel Series: Hearing Protection SNR: 26 NNR: 31 How to Wear: Headwear Lining Material: Sponge Suitable for Noise Environment: 32 Thickness of Cup Cover: 3MM
