Heat sink Aluminum heat sink Product parameters Adaptation: Firefly-RK3399 size: 43mm (L)* 39.5mm(W)*11mm(H) Real figure Installation Integral Cooling Fan Product Parameter Model: TFAN_55S_B Adapter: Firefly-RK3399 Size: 5.5±0.3mm * 55.5±0.3mm Voltage: 12V (10.8-13.2V) Max air flow: 5.8CFM Physical map Installation method