Made of ABS plastic, with Aluminum carabiner attached; Power/Technology: Rechargeable Lithium-Ion battery: 400 mAh/37V; Input: DC 5V; Output: 3W; Frequency 100hz - 20khz; SNR: 80dB; Transmission Range: up to 10m (30 ft); Water-resistant to IPX5 standard* (splashes of water only; DO NOT SUBMERGE); Water-resistant to IPX5 standard* (splashes of water only), DO NOT SUBMERGE; Functions include: speaker, FM radio; Connects to your mobile device using wireless technology, can also connect through 35mm audio cable (included); Device lights up red while charging battery Light turns off once charge is complete; Includes USB to Micro USB charging cable and 35mm audio cable; Speak hands-free into built-in microphone; Instructions included; FCC approved; 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.