2Speaker RC Siren Whistle Sound Groups Simulation For RC Ship WhistleDescription 2Speaker RC Ship Whistle Siren Whistle Sound GroupsFeature 1 The third channel or other accessory channel panel control suit any switch channels of remote control2 Two kind of sounds long and short Specification supply scope 6 12VColor as the picture shownWeight 40g Size 6 3 5 2 5cmManufacturer recommended age 14 years and up Note 1 If using the 3S battery from electrical please contact customer service And to modify module Otherwise it will burn amplifier 2 Any use of battery powered devices for more than 2 or 2 blocks of using this product please ask customer service Otherwise may cause equipment destroyed 3 Handmade welding not like factory batch products such as beautiful 4 Size described above may be a little bit vary from the real one due to manual measurement please make sure you do not mind before you bid Package Included 1 X Sound Groups