
Not pairing or connecting 2 devices There is no volume control. The volume will suddenly burst your eardrums and then just as suddenly stop. The volume cannot be kept constant. Pairing and connecting was complete crap. On average, you can connect after 3 attempts. DO NOT SPEND YOUR MONEY. There are $19 alternatives that work as expected. I even tried using two different brands of headphones to see if it was the earpiece or the transmitter with the same poor results.

Experience Dynamic Audio with Panasonic SC-UX100 CD & USB Wireless Bluetooth 300W Mini Hi-Fi System Shelf Stereo
19 Review

JBL Horizon Bluetooth Alarm Clock Radio with Multiple Alarms, Soothing Ambient LED Light, Automatic LCD Display, and Dual USB Charging (White, AM/FM Radio)
41 Review

Sangean PR-D4W Portable Weather Alert Radio with AM/FM Bandwidth Narrowing and Auto Tracking for Improved Searchability
12 Review

KLIM CD Boombox Portable Audio Player with FM Radio, Rechargeable Battery, Bluetooth, MP3, AUX, Neodymium Speakers, and Upgraded CD Laser Lens (2021 Edition)
11 Review