If you're comparing boAt Rockerz 400 and boAt Immortal 121, both models offer a strong combination of sound performance, comfort, and modern wireless features. Battery life varies between the two (8 Hours vs 10 / 40 Hours), which affects how long you can use them on a single charge. boAt Rockerz 400 uses Bluetooth 4.1 while boAt Immortal 121 supports Bluetooth 5.3, which can impact connectivity stability and efficiency. There is a noticeable difference in weight (118 gm vs 45 Gm), which may affect comfort during extended use. boAt Rockerz 400 and boAt Immortal 121 offer different noise cancellation capabilities (CVC vs NA), which can impact how effectively they block external noise. The driver size differs between the two (40 mm vs 10 mm), which can influence sound depth, bass response, and overall audio clarity. Both models provide a wide frequency range, delivering a balanced audio experience across different types of content. Impedance levels vary (32 ohm vs NA), which can affect compatibility and audio output when used with different devices. Overall, both headphones are feature-rich and cater to users looking for a combination of sound quality, comfort, and wireless convenience.

Verdict: Choosing between boAt Rockerz 400 and boAt Immortal 121 depends on whether you value better sound, longer battery life, or enhanced features.