Hi-Fun Portable Bluetooth Stereo Speaker is a Powerful Technological Grenade Ready to Explode with Music. it is Perfect to Carry. hi-Bomb Bluetooth is a powerful technological grenade ready to explode with music! Frequency response: 20-20KHz Power: 3.7V Li-Battery Battery duration: 6 hours (play) 2 hours (charging) Bluetooth version: BT3.0 Amplifier power: 3W x2 Dimension: H 7,8cm - L 6,7cm - W 5,8cm Weight: 121g