Grumpy Old Geeks Products Sennheiser HD1 Free Product Sennheiser HD1 Free 2 mentions in 1 episode The HD1 Free is a Bluetooth headphone model reviewed for its sound quality and battery life. Mentions 430: Another Day in Paradise Apr 11, 2020 1:03:27 I got the Sennheiser HD one free Bluetooth wireless headphone 1:04:04 These are a little lacking in bass for me