Features: Portable Bluetooth Speakers wireless: The most stable Bluetooth technology 4.0 EDR and CSR chip in the market are used in the wireless Bluetooth Speaker. It supports any Bluetooth devices with vesion 4.0 or above 4.0 in the market. The built-in high-sensitive microphone can support for hands-free calls. In addition, 3.5mm audio cable is provided to connect with other product without Bluetooth speaker. Mobile Power Supply: With 20-hours play time (It usually depends on the volume and play content), imported lithium ion battery capacity 5200mAh is installed in the Bluetooth Speakers and supply power to any electronic devices with standard USB interface. Dimension and Shell Material: Dimension: 1827070 mm Shell Material: Made of the best anti-skidding ABS silicone, the silicone and Metal becomes the externally sturdy and durable shield. Besides, it can protect itself from daily water, shock and dust. Bluetooth Speakerphone: With built-in 10w dual -loudspeaker in the Bluetooth Speaker, it has HI-FI audio effect, low-frequency stereo audio, clear voice and deep bass effect. Applications: It can be used in bathroom, beach, swimming pool and outdoor exercise.