It has a magnetic attraction function and can be easily attached to items that support magnetic attraction. When paired with a magnetic attraction ring, it is more convenient for daily use. Specification parameters Distortion limit output power :5w Bluetooth protocols :A2DP, AVRCP Rated sound frequency response range :250Hz-15kHz Noise level :≤25dB(A) Speaker unit :40mm dynamic driver Speaker impedance :4Ω Bluetooth range: approximately 10 meters. Battery life: approximately 6 hours Rated input :5V 450mA