ABS plastic, with Aluminum carabiner attached;Water-resistant to IPX5 standard; Functions Include: speaker with hands-free built-in microphone, FM radio; Power/technology: rechargeable lithium-ion battery: 400 mAh/3.7V; input: DC 5V; output: 3W; wireless 2.1; frequency 100Hz – 20kHz; Connects to your mobile device using wireless technology, can also connect through 3.5mm audio cable (Included); Approx. playback time: up to 2–4 hours; Includes USB to Micro USB charging cable and 3.5mm audio cable; Instructions Included; Product Size: 4.75" w x 2.25" h x 1.25" d; Shipping available to contiguous U.S. addresses and Canada via Ground only. Cannot ship via Air, Internationally or to Alaska, Hawaii, Puerto Rico and any other small U.S. island territory.;