Item Type: Under Pillow SpeakerMaterial: ABSSize: Approx. 132x52x10mm / 5.20x2.05x0.39inBt Version: Version 5.3Connection Distance: 10m/32.8ftPlayback Time: About 20 Hours (Sleep Mode)Battery Capacity: 500mah (Included)Charging Time: About 2 HoursCharging Voltage: 5V 500mAStandby Time: 30 DaysMaximum Support: 32GB Memory Card (Not Included)Supported Sound: MP3 WMA AAC APE FLACPlanned Downtime: 30 Minutes 60 Minutes 90 MinutesInterface: Type C Charging Interface Package List1 x Under Pillow Speaker1 x Lanyard1 x Charging Cable1. Manual measurement please allow some error.2. It is placed in the middle of the pillow, sleeping on the side, so that you can better listen to music, to help get a better sleep.1Conduction Technology: Mini bluetooth conduction pillow speaker uses the latest conduction technology to vibrate the sound through the pillow to the ear. You can avoid disturbing the family next to you while listening to music. 2Improve Sleep: Soft music from the under pillow speaker helps relieve stress and helps to fall asleep faster. Ability to listen to music in private without disturbing others. Tailored to relieve stress and help with deep sleep. It provides great help for adults and babies to fall asleep and get rid of insomnia. 3Long Battery Life, Bluetooth 5.3: Mini conduction speaker can work continuously for about 20 hours and fully charged in about 2 hours, providing you with a more continuous and comfortable music experience. Wireless pillow speaker with Bluetooth 5.3 version, using a premium chip to ensure stable and clear sound. 4Timing Function: Bluetooth pillow speaker with timing function, see set 30 minutes 60 minutes 90 minutes after the automatic shutdown, to bring you a peaceful night sleep and save power. 5MP3 and Bluetooth Mode: Conduction pillow speaker supports MP3 mode and Bluetooth mode to play music, MP3 mode can use memory card to play music (up to 32GB, not included), Bluetooth mode can be connected to cell phone Bluetooth to play music. 6Dual Modes: The speaker supports two types of sound, respectively, vibration sound bone induction technology sound and air conduction sound of conventional speaker technology. Bone induction technology is suitable for listening to music alone, to avoid disturbing others; conventional speaker technology is suitable for daily use, you can spread the sound to the neighborhood, and others to share music, as ordinary speakers.