Weather Resistant Heavy-Duty Construction - Rotational Molded Weather proof Polyethylene50-watt amp with built-in wireless 16 Channel UHF receiverOperating frequencies 655 to 679 MH Built-in Carry Handle & Detachable adjustable shoulder strap Built-in 1.5" (38 mm) Diameter Tripod mount Built-in USB Charger for charging Smartphones & Tablets Sensitivity (SPL): 106 dB at 1 meter with 1 watt input Emergency Siren Button Quick Set Up Guide printed on control panel