Mini mobile vibration speaker

This is an ideal mini speaker for you listening to music anytime and anywhere. Perfect for carrying around to compatible with your beloved iPhone, iPad, laptop pc or any other audio equipments! Specifications: Color: Rose/Black/Blue/Yellow(Optional) Housing material: Plastic Power supply: Rechargeable lithium battery Battery voltage: 3.7V Battery charging voltage: 4.2±0.05V Rating power: 1.8W Frequency response: 100Hz, 20kHz Signal-to-noise: ?85db Distortion: