Bluetooth Technical Parameters: Bluetooth version: 5.0 Bluetooth transmission distance: 10m Music Playing Time: Maximum sound 7h, average volume 10h Microphone distance: 1m Bluetooth standby time: 72h Battery capacity: 150mA/h Battery power: 0.55w Horn impedance: 32 ohm Horn power: 0.02w Frequency range: 2.4-2.4835ghz Sensitivity: 45dB Audio output distortion: 0.6% Audio output SNR: 93dB Charging time: 1-2 hours Maximum input voltage: DC 5V Max input current: 150mah Maximum input power: 0.55w