1. Bluetooth 5.1 2. ABS plastic 3. Unfolded size: 304.31 x 98.1 x 9.86mm 4. Folded size: 152 x 98.12 x 19.83mm 5. Built-in 140mah high-capacity rechargeable lithium battery, long standby 6. 3-channel Bluetooth connection, Up to 3 Bluetooth devices can be connected at the same time and you can switch between 3 devices at will
