•【Innovative Bone Conduction Technology】This sleep speaker uses bone conduction technology to deliver sound without disturbing others, perfect for a peaceful night's rest. •【Versatile Playback Options】Enjoy music via Bluetooth-compatible connection or TF card, supporting various audio formats including MP3, WMA, FLAC, APE, and WAV. •【Long-lasting Battery Life】With up to 15 hours of playtime at 80% volume, this device ensures uninterrupted sleep assistance throughout the night. •【Easy Operation】Features a multi-function composite key for simple control and LED indicators for clear status display. •【Comfortable Design】Simply place under your pillow for use, no need for in-ear wear, providing a comfortable and harm-free listening experience. Specifications: •Horn type: 8Ω/2W •Frequency response: 20HZ-20KHZ •Bluetooth-compatible solution: BLUETRUM •Bluetooth-compatible version: V5.2 •Bluetooth-compatible protocol: A2DP 1.0 AVRCP 1.5 AVDTP 1.0 AVCTP 1.4 HFP 1.5 GAVDP 1.0 •Decoding method: TF card (MP3, WMA, FLAC, APE, WAV); Bluetooth-compatible (SBC) •TF card: Maximum support 32G (not included) •Operation distance: ≥10 meters •Normal working time: Play music: ≥15H (80% volume), standby time: about 15 days •Prompt voice: English prompt tone •LED light: Red and blue status indicator light •Operation method: Multi-function composite key •Battery capacity: 500mAh/3.7V •Charging method: TYPE-C charging port •Charging cable: 30cm TYPE-C charging cable •Charging time: 2.0H •Charging current: DC5V/310MA •Charging voltage: 5V •Product material: ABS+PC plastic shell Package included: •1 x Under Pillow Speaker •1 x Charging Cable •1 x English Instruction Manual