AMPLIFIER SIMULATORS Vox amPlug 2 Bass Mini Headphone Amplifier. With amPlug 2, the analog circuitry has been dramatically improved, and each model now offers three modes. Modes: TInputGain Hi / Mid / Lo. Rhythm Patterns: Pops, Rock, Shuffle, Jazz, Funk, Skip, Samba, Special, Click. Connections: Headphone output, AUX in. Power: AAA x 2 batteries. Battery life: 11 hours (with alkaline batteries, RHYTHM on), 17 hours (with alkaline batteries, RHYTHM off), 4 hours (with zinc-carbon batteries, RHYTHM on), 9 hours ( with zinc-carbon batteries, RHYTHMoff). Dimensions: (W x D x H): 86 x 80 x 31mm. Weight: 40g (without batteries). Accessories: 2 x alkaline batteries (for functional check)