PTT - Push to Talk. Connect instantly with a single or group chat. Loud Audio 2.3 mm speakerUltra Rugged. IP-68 Submersible up to2 meters for 1 hour in water. Impervious to dust and micro particlesBeyond Mil Spec -810G Drop test. Withstands 2 metter drop test.Corning Goriliia Glass for Extreme Shock & Scratch Resistant. RPS CertifiedAT&T, Clean ESNNetwork Type: GSM