Design with small size and modern fashion look.built in boost circuit with loud sound reached 100 db
With rechargeable 280 mAh lithium battery,used more convenience .USB cable charge 1.2 hours full charge
Humanized Switch and Volume Adjustment Multi-function button set is added on the back to achieve volume adjustment and on off function. Volume 50-100dB
Have 4 sound modes, Metal Bell, Whistle, Tram Bell, Vibration Bell. Dust resist, IP 65 waterproof level
Sound Upgrade Classical Ringtone Reappear Moderate frequency sound, eliminate sudden harsh sound, protect the ear from stimulation. Imitation Physical Sound, Not harsh and clear enough.