Crescendo Pro hearing protections has been developed to meet 4 basic needs : - Enjoy music at safe listening levels and help preventing hearing damage - Offer a natural sound preserving dynamism, clarity and balance between frequencies - Allowing speech to be heard and conversation to be followed without having to remove the protection - Being comfortable for long hours of usage (compact size, no part outside the ear, no pressure in the ear, natural ventilation) Dynamic Ear Company filter meets all these criteria. The success of this filter is measured by its utilisation by many custom earmoulds manufacturers. Features: - CE standard: SNR 17dB (full system ear plug filter), filter alone is 20dB - Patented membrane filter technology providing protection, ensuring clarity of sound with full music dynamic - Tuned, flat attenuation response so all frequencies are reduced by the same level, which makes it the best high fidelity hearing protection on the market - Made in The Netherlands Crescendo Amplified 20 (a.k.a. Crescendo Vocals, Guitar, DJ) has been designed specifically for musicians and music lovers and is best suited for (non-exhaustive list): - Singers - Dance festivals - Amplified music - Pop concerts - Rock concerts Package contains: - Two Large universal ear plugs - Two Medium universal ear plugs (S XL universal ear plugs available on request) - Two acoustic linear damping filters providing 20 dB damping and which are 100% acoustically tested - Aluminium key-ring carrying case