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3-LAYERS OF INSULATION Food grade leak-proof liner PP LINER PU FOAM PE SHELL Polyethylene: durable, impact-resistant, and safe for health-related uses. Polyurethane is the optimal insulation material for refrigeration. Polypropylene: Resistant to both cold and heat. Maintains stability at high temperatures with minimal water absorption. On-Ice 21L Sound Box (IGOISB) 21 Litre Bluetooth 5.3 water resistant (IP44) Speaker PP Lid, with PE Shell, PP Inner and PU Interlayer Food grade thickened PP plastic leak-proof insulated liner Food / beverages Hot for 12 Hours / Cold for 72 Hours Powerful 2 x 5W speakers compatible with all smartphones, Bluetooth 10 metre range Rechargeable battery: 3.7V/1500mAh Approx. 3-6 hours of run time, Approx. 5 hours of re-charge time Multi functional Speaker: Bluetooth mode, TF (micro SD), FM Radio, volume/play controls Foldable PP carry handle Double hinged lid secured with dual latches Integrated tie-down holes Type-C charging cable included Ion Grit Logo on function panel Colour: black/steel grey Dimensions: 45.5cm W x 31cm H x 33cm D (excluding handle) COOLERS 33