Bryston is an electronscs and speaker manufacturer based in Canada. Although they do not have a large presence in the personal audio space, both their Digital - Analog convertors and the BHA (Balanced Headphone Amp have built solid reputations.
The BHA-1 is a fully discrete balanced, solid state class A amplifier rated to produce 2 watts into 32 ohms. It has one pair each balanced and single ended inputs as well as a stereo 3.5mm input jack. There is also a pair of balanced outputs.
(Image from Bryston.com)
The front panel has an input selector, a high /low gain switch, volume, balance, single ended 1/4", dual 3 pin balanced and4 pin balnced outputs, and a power light and switch.
Ful details are available at https://bryston.com/amplifiers/bha1/