This headphone amplifier by Delock is the mobile companion for all audio enthusiast. It provides up to five times higher output power of the analogue audio input signal. 3 different bass boost levels can be selected by the built-in slide switch. Due to the two 3.5 mm stereo jack female outputs, two headphones can be connected at the same time.Always enough power on the wayThe integrated rechargeable battery does not put additional load on the mobile audio source, e.g. mobile phone or tablet. The fully charged battery allows up to 8 hours of audio playback.