SMSL MINI5 is based on TDA7492 CHIP ,Multifunctional speaker power amplifier, built-in headphone amplifier. MINI5 has easy operation, perfect quality, ultra-low power consumption. Will bring you a noble visual, auditory feeling. Technical specifications: Color Category: Backchannel : 2Output Power : 50W 2Size : 132mm 73mm 30mm ( including protruding parts )Caution: It adopts air-core inductance coils. This material can produce a very good sound. but it has a drawback : it produce more heat than other amps. In general, it is 68 degree F higher than other amplifiers. It is safe and normal, Please use it at ease. Package list: SMSL MINI 5 5Power supply1Mini screwdriver 1Power cable 1Manual1