specifications is as belowed 
Power source:3.7V-6V          Power output: 8W           
Recording time: 10s                         Audible range: 350m                Weight: 448g  (without battery )                      Dimension: (L)249mm*(D)150mm                functions: Talk/Record/Play/Siren 
Battery: use 1 piece rechargeable battery or 4 pieces D battery