Compatible with a CD Player, Clock Radio, Smartphone or any Device Fitted with a 3.5mm Headphone Output Unique Speaker Chamber Design which reduces annoying frequency range for better personal listening without Disturbing others Super Thin Flat Design allows you to listen by placing it under your pillow or close to your ear Listening distance: 10 cm, Frequency response: 100-15 kHz, Handling Power: 50 mW Maximum, Cable length: 5 feet Power source type: DC Connectivity technology: wired Sangean Pillow Speaker - Color White