Horn diameter: 10MM

 Horn impedance: 16 + 15% ohm

 Horn sensitivity: 95 + 3dB at 1kHz

 Horn rated power: 3 MW

 Trumpet frequency range: 20-20KHz

 Microphone sensitivity: -42 + 3dB

 Frequency range: 20-20KHz

 Bluetooth version: CW6687B 4

 Transmission distance: open ground 10 meters

 Play time: about 6 hours (medium volume)

 Type of battery: polymer lithium battery

 Battery capacity: 3.7V/100MAH

 Charge time: 1-2 hours