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Tropical Leaves


233621 or THE NUMBER BRAND as some people prefer to call us is an environmentally responsible audio brand.


233621 was built on the following environmentally sustainable pillars:


Reducing Energy Consumption – 233621 headphones are manufactured in Shenzhen International Low-Carbon City in China, a leading project of the sustainable urbanization cooperation between China and the European Union.

Sustainable Packaging - At 233621 we aim to ensure that more than 90% of our packaging is recyclable. Our packaging might not look as good as some of the others...but it's kind to the environment.

We believe you can enjoy your music and be kind to the environment as well.

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