Impedance levels vary (24 ohms vs NA), which can affect compatibility and audio output when used with different devices. The frequency response differs (22 - 19500 Hz vs 20 Hz - 20000 Hz), which can influence how well the headphones reproduce lows, mids, and highs. Both models support modern Bluetooth connectivity, ensuring stable wireless performance with compatible devices. Battery life varies between the two (20 - 25 hrs vs 15 Hours), which affects how long you can use them on a single charge. Both models feature noise cancellation, helping reduce background noise for a more immersive listening experience. The driver size differs between the two (NA vs 12 mm), which can influence sound depth, bass response, and overall audio clarity. In general, both options are suitable for everyday use including music, calls, travel, and work-from-home scenarios. Sennheiser RS-120 and Sony WI-SP510 are premium wireless headphones designed to deliver high-quality sound along with advanced features like noise cancellation and long battery life. There is a noticeable difference in weight (230 g vs 30 gm), which may affect comfort during extended use.

Verdict: Choosing between Sennheiser RS-120 and Sony WI-SP510 depends on whether you value better sound, longer battery life, or enhanced features.