Both the boAt Rockerz 450 and Rockerz 510 are wireless Bluetooth earphones, but there are a few key differences between the two models: Battery life: The Rockerz 450 has a battery life of up to 7 hours, while the Rockerz 510 has a battery life of up to 10 hours. Connectivity: The Rockerz 450 only supports Bluetooth 4.2, while the Rockerz 510 supports Bluetooth 5.0. Water resistance: The Rockerz 450 has an IPX5 water resistance rating, while the Rockerz 510 has an IPX7 water resistance rating, making it more water-resistant. Audio quality: The Rockerz 510 has a more powerful bass and more clear audio than the Rockerz 450. Price: The Rockerz 510 is usually priced higher than the Rockerz 450. So, depending on your needs, you can choose the one that suits you the best.