Drop x Hifiman HE5XX is a planar headphone made in collaboration between those two companies. It costs 220USD.
Hifiman Ananda is a planar magnetic headphone, which has been vastly popular in a $1000 market since its release. Price is set at $999.
After the huge success of the Bluetooth Deva, Hifiman decided to launch its wired version, pricing it at $219. As usual, it is a planar-magnetic headphone promising an unrivalled value.
Hifiman RE400 is an earphone powered by a single dynamic driver, and it is the lower model of the “Waterline” series. It is priced at 79USD.
Hifiman HE-400i 2020 is a new over-ear planar magnetic headphone coming at 169 USD, making it +/- 3 times less expensive than its predecessor.
Hifiman TWS600 is a TWS earphone with IPX4, very good battery life and neutral-bright sound. It is priced at 199$.