Features 1、[Bone Conduction Sleep Speaker] This bone conduction pillow speaker can be placed under the pillow without leaking sound, allowing you to enjoy music alone without affecting others. 2、[Auto Timed Shutdown] This pillow speaker can be timed to shut down, with three timing settings: 30 minutes, 60 minutes, and 120 minutes, allowing you to sleep peacefully. 3、[Bluetooth 5.4 Mode] Using the latest Bluetooth chip, fast and stable in connection, with low latency and low power consumption, clearer sound. 4、[Memory Card Playback Mode] This speaker can play music files from a memory card (card not included), without the need for a device. 5、[Long Battery Life] This under pillow speaker has built in 400mAh rechargeable li battery, providing up to 8 hours of continuous listening, allowing for quick charging. Specifications: Item Type: Under Pillow Speaker Material: ABS Connection: BT5.4 Battery: 1 x 3.7V 400mAh Rechargeable Lithium Cell (Built in) Charging: About 2 Hours Distance: 10 Meters Input: 5V 400mA Playback Mode: BT, White Noise, Small Memory Card (Not Included) Color: Black Package List 1 x Under Pillow Speaker (Without Small Memory Card) 1 x USB Cable 1 x User Manual