1、-Comfortable sleeping environment and comfortable white noise.Just place it under your pillow when you nap during the day or go to bed at night to create a pleasant sleep environment. 2、-Timer function. If you want to listen to music and white noise while you fall asleep, but don\u0027t like the sound until the morning, you can set a timer that will automatically turn off after 30 or 60 minutes. 3、-Pillow Speaker can not only play music via BT connection, but also play music by inserting a T-Flash card ( SD card). If you\u0027re going to listen to songs or white noise, put them in your T-Flash card and plug them into your pillow speakers! You don\u0027t have to search for songs or white noise, so you can enjoy it easily! 4、-The pillow speaker is equipped with BT 5.0, which has fast transmission speed and wide transmission range. Compared with BT 4.2, you can experience faster pairing speed, wider transmission range and wider data transfer. So even when the pillow speakers are under your pillow, there is a stable connection and you can listen to your music without worrying about the sound being interrupted. 5、-Call function. You can make stable calls and hear crystal clear voices via BT 5.0. Also, since the Pillow Speaker is equipped with a microphone, you can place the Pillow Speaker to your ear and make calls without picking up your smartphone. Title： Pillow Speaker Sleeping Bone Conduction BT5.0 Timer T-Flash Card Fast Charging Portable Size Features： -Comfortable sleeping environment and comfortable white noise.Just place it under your pillow when you nap during the day or go to bed at night to create a pleasant sleep environment. -Timer function. If you want to listen to music and white noise while you fall asleep, but don't like the sound until the morning, you can set a timer that will automatically turn off after 30 or 60 minutes. -Pillow Speaker can not only play music via BT connection, but also play music by inserting a T-Flash card (Micro SD card). If you're going to listen to songs or white noise, put them in your T-Flash card and plug them into your pillow speakers! You don't have to search for songs or white noise, so you can enjoy it easily! -The pillow speaker is equipped with BT 5.0, which has fast transmission speed and wide transmission range. Compared with BT 4.2, you can experience faster pairing speed, wider transmission range and wider data transfer. So even when the pillow speakers are under your pillow, there is a stable connection and you can listen to your music without worrying about the sound being interrupted. -Call function. You can make stable calls and hear crystal clear voices via BT 5.0. Also, since the Pillow Speaker is equipped with a microphone, you can place the Pillow Speaker to your ear and make calls without picking up your smartphone. Specification： Chip: Version 5.0  Support MP3-8GB memory Receiving distance: within 10 meters Signal-to-noise ratio: >75dB Distortion: <1% Working frequency: 500HZ – 40,00 HZ Horn diameter: 20.8 mm Speaker Impedance: 8 ohm Speaker power: 2W *2 Charging input voltage: DC5±0.25V Battery Specifications: 3.7V/400mAh Working voltage: 3.7V (3.3-4.2V) Charging time: ≤3H Microphone sensitivity: -42±3DB Low voltage prompt: 3.0V Speaker specifications: 16Ω±15% Continuous play music time: 8H-12H Standby connection time: ≥200H Working current: ≤30mA (the bigger the volume, the bigger the current) Quiescent current: ≤5uA Pairing Name: PillowSPEAKER Pairing code: 0000 (phones lower than V2.1) Package list： 1*Pillow Speaker 1*Manual 1*USB cable 1*Pillow Speaker 1*Manual 1*USB cable