DC 无线门铃，编号：RL-3930

- Battery-powered wireless door chime - With touch button and name panel - 38 pleasant chord ringtones - Millions of learning code and digital transmission to avoid interference effectively - RF: 433.92MHz ±250KHz - Working distance ≥150m (open area) - 4 Levels volume adjustable - Powered by 3*AA alkaline batteries (not included)