Description This sound unit is developed for electric powered RC trailer or truck It could be used to 1 32 1 24 and 1 18 RC vehicles especially suitable for 1 24 ITALERI and Revell 1 24 series model RC conversion rovide more than 30 different sound files for many Europe and US trailer and truck engines Features Sound quality 22KHz Internal 1W amplifier at 8 Ohm speakers Receiver signals are used for speed information this allows brushless or DC Motor usage Fully assembled in SMD technology no heavy vibration sensitive components All wires included Very little dimension and weightTechnical Data Brand DasmikroItem Programmable Sound Unit Dimension 11 x 23 5 x 3 2mm min 11x16x3 2mm Voltage 3V to 5V supplied by the receiver Note the maximum supply voltage of 5V Current app 10mA without sound app 250mA at max volumeSpeaker 8 32 OhmOutput power 1W at 8 Ohm at 5V 0 6W at 8 Ohm at 3VProportional inputs 1ms to 2msSound quality up to 22 kHzSound selection play by a 3 position switch toggle switch This control mode need a toggle switch with neutral position recommended or a common proportional channel Selecting a sound or function The desired sound e g sound 3 or function is selected by pushing the switch stick 3 times from its neutral position to high position 1 8ms The selected sound fuction is triggered played by pushing the switch stick to low position 1 2ms The last selected sound function can be triggered multiple times without new se