【High-Quality Material】: The product is designed with a new robust and durable ABS housing. Independent design, more practical, the owner can use it to recruit guests during the day, in the evening can be used to prevent theft. 【4-Level Adjustable Volume】: The product has four adjustable volume levels: bass mode, medium sound mode, high sound mode and super high mode, with a minimum of 25 decibels and a maximum of 113 decibels. You can adjust the volume according to the actual situation. For example, if you use it in the shopping mall, you can use the super strong mode. 【2 Power Supply Modes】: Battery powered/DC 5V powered, 8 chord music melody, 40mm large horn, 36 clock melodies, remember your last melody and volume level when turned off. 【Multifunction 【5 in 1】: This set of products contains five functions for welcome/doorbell/alarm/light/lighting. It is very practical, low in price and complete. You will not regret after buying it. 【Scope of Application】: applicable to shops, shopping malls, luxury hotels, offices, factories, homes, villas, alleys, walkways, supermarkets, restaurants, etc.