A compact megaphone with folding handle and wrist strap for ultimate portability. Speech is picked up by the inbuilt rear microphone and amplified up to 10W output with an optional siren for alerts. Powered from a removable 18650 Li-ion cell for convenience and economical performance.Battery[tab]Li-ion 3.7Vdc 1500mAh (supplied)[br]Rated output power[tab]10W[br]Range[tab]200m[br]Dimensions[tab]220 x 140mmØ[br]Weight[tab]450g (no battery)[br]Power supply[tab]5Vdc (USB), 500mA min.