Get your message seen and heard with the Trumpet! No external power needed. Naturally amplifies sound from selected smart phone models (iPhone 4, 4S and 5 compatible). Made from soft-feel silicone material; it's washable, dirt and scratch resistant. Available in a choice of four standard colour options or pantone matched to suit your brand (subject to a minimum order quantity of 2000 pieces and a minimum 7-8 week lead-time)!