Loudspeaker Bluetooth Speaker Portable Stereo Handsfree Music Square Box Mini Wireless Speaker for Compute Phone PC Specifications: Bluetooth version: 4.2 Signal noise ratio: ＞70db Rated power : 3W Bluetooth range: 10 meters Radio frequency: 20Hz～20KHz Degree of distortion: ＜1% Battery capacity: 300mAh Charging voltage: DC5V Product weight: Around 30g Product size: 34x28mm Product Material: Metal+ABS