Apple’s New Beats Solo Buds Are Dirt Cheap and Have a Long Battery Life GizmodoBeats Solo 4 review: playing both sides The VergeThese hot new Beats Solo 4 headphones are available for preorder CBS NewsBeats announces Solo Buds, $80 wireless earbuds with 18-hour battery life EngadgetBeats Solo 4 hands-on: the most iconic Beats headphones just got better 9to5Mac