Specification: Product Model: ZS 01 Bluetooth Version: 5.1 Rated Input: 5V 1A Playback Time: about 20 hours Charging Time: approximately 3 hours Product Size: 6.1 *1.4 *0.5 inches(15.5*3.5*1.2 cm) Product Weight: 0.13 pounds Product Color: white, black Bluetooth Distance: 5-10M Package Contents: Bone Conduction Bluetooth Sleep Speaker *1 Type C USB Cable*1 Instruction Manual (in English and Chinese)*1 Easy to Use Simply press and hold the on button for 3 seconds to turn it on or off. When the blue indicator light flashes, it indicates that the sleep speaker has been turned on; Disconnect Bluetooth connection and automatically shut down after 5 minutes Properly Placed With the silicone pad of the Bone conduction Bluetooth sleep speaker facing down, the plastic shell surface can fit the pillow to enjoy the best music effect Usage Mode You can adjust the volume level through your phone. Within 50% of the volume, there is a soft sound effect, no leakage, no disturbance to others, and 50% -100% of the volume is in entertainment mode Multi Scenario Usage This Bone conduction sleep speaker is specially designed for relieving sleep. It is a good choice for relieving insomnia at night, taking a rest in the office or traveling on business