Brand G.T.POWER Quantity 1 Piece(s)/pack Color Black Material Plastic Compatible device It applies to Rcexl series ignition Functions Reflect the working condition of engine Other Feature Adapts PIC micro processor; Small size easy to install and carry; Engine supply power no need external power supply; FUTABA standard interface; 4-digital LED display; Max. range up to 30000RPM; With self detection function; Specification: Working voltage: 3~12V; Working current: 25~60mA; N.W.: 16.5g; G.W: 55.5g; Size: 5.4cm x 2cm x 1.5cm; Suit for Rcexl series ignitor; The cable length of tachometer: 20cm Packing List 1 x Tachometer 1 x Y cable 1 x Velcro 1 x Chinese / English user manual