1、BT 5.3: This mini speaker adopts BT 5.3 chip, transmission distance up to 10m, low power consumption and stable signal, realizing true wireless freedom. 2、TANDEM SURROUND SOUND: Simultaneously turn on the two speakers and then take any one of them to double click the on off key for interconnecting action. When you hear the tone, it means interconnecting is successful. At this time, the two speakers will play the songs synchronously. 3、EXCELLENT LISTENING EXPERIENCE: With a bass diaphragm powerful sound field, create a shocking bass effect and 360° equal coverage of the surround sound effect, giving users an immersive listening experience. 4、MULTI DEVICE COMPATIBILITY: This mini speaker is intelligently compatible with cell phones, tablets, computers and other devices, providing a more convenient music experience. 5、LANYARD DESIGN: It comes with a lanyard, making it easy to carry, making music everywhere and immersing users in the enjoyment of premium music. Item Type: Mini Speaker Material: Aluminum Alloy BT: V5.3 Frequency Range: 30Hz-15kHz BT Distance: Straight Line Without Obstacles 10m / 32.8ft Battery: Lithium Battery 300mAh (Built In) Charging Port: TYPE C Port Charging Time: 1.5H Working Time: ≥3H At Maximum Volume 1 x Mini Speaker 1 x Lanyard 1 x Instruction Manual 1 x USB Cable