Best Brass e-Brass IV Trumpet Practice Mute - digital echo function variable, stereo mini-jack input jack allows an external sound source to be combined with the signal from the mute. Mini-jack line/phones output allows the system to be connected to earphones for private practice, an external sound system or recording equipment. Compact size, very silent (approx -30dB), for Bb and C trumpet. Weight: ca.82g, size: 125x80 mm. Including connection cable and play-along CD