Sangean America, Inc. PS-300 Pillow Speaker with In-line Volume Control and Amplifier (White)

Compatible with a CD player, clock radio, smartphone or any device fitted with a 3.5 mm headphone output
On and off built-in amplifier, with the amplifier setting on, you can easily turn up the volume to the next level. With the amplifier off, you can listen with privacy and save battery life (Note: 1 AAA battery not included). Most pillow speakers available today have very low volume output, but with singeing PS-300 youll have enhanced and adjustable volume control
The PS-300 features an in-line volume control that allows you to adjust the volume level to your listening comfort
Extra flat unique speaker chamber design which reduces annoying frequency range for better personal listening without disturbing others