The Casambi Tunable White 2 × 4A Bluetooth DIN-rail module by Casambi is a smart and compact LED controller designed for tunable white lighting, featuring two channels with up to 4A PWM load each and allowing dynamic adjustment of colour temperature from warm to cool white via Bluetooth and the Casambi app without the need for wired control systems or a central controller, making it ideal for advanced lighting projects in offices, retail and residential environments where flexibility and lighting comfort are essential.