Item Type: Bluetooth SpeakerMaterial: MDFFrequency Range: 90Hz-18KHzImpedance: 4Bluetooth Protocol: 5.0Built in Polymer Lithium Battery: 7200mAh (included)Package List1 x Speaker1 x Charging Cable1 x Cable1 x Manual1[Clear Sound] Equipped with two 76mm / 3in speakers, it can cover a range of 300indoor, with clear and thick sound without noise, and easily control all kinds of music. 2[MDF Material] Medium density fiberboard effectively eliminates bad resonance. The workmanship is meticulous, and every detail is carefully polished to ensure high quality life enjoyment. 3[Stable Transmission and Connection] 010m / 033ft effective Bluetooth connection, Bluetooth 5.0 version, more stable transmission, intelligent fast connection, support for voice calls. 4[Playback Mode] Bluetooth, AUX, and memory card playback can be freely selected to meet the needs of multi scene playback, and enjoy good music anytime, anywhere. 5[With Lithium Battery] Built in 7200mAh lithium battery (included), low energy consumption, stable performance and can also be used while charging (common for charging head and mobile phone). 6[Wide Compatibility] Compatible with Bluetooth devices such as phones, tablets, computers, etc., easy wireless connection and compatible with for Windows, for iOS, for Android and other systems.