5 Mode Choices: Welcome / Doorbell / Alarm / Color light/ Lighting: 1, Welcome reminder mode ( default ): Ding + welcome sound. 5 kinds of multi-language welcome tone, with key selections easily switch. 2, Doorbell Mode: door open chime, 36 selectable chimes tunes for . 3, Alert mode: Daytime & Night anti-theft mode, the detector sensor illegal intrusion, immediately sounded 113 dB treble alarm , wake or alert you if and possibly alert neighbors. User-Friendly,4 levels volume adjustment (Loud/High/Middle/Low ) from 113-25dB,Colorful LED lights, brightness can adjust, can use different colors to distinguish different entrance, more intelligent! alarm horn,maximum 113dB, can effectively deter thieves! Volume can adjust, have memory function when change the battery, more considerate and more comfortable!Can maximum learning 32 infrared, vibration, magnetic etc wireless sensor accessories and 8 remote controllers. Applicable to all kinds of shops, clubs, hotels, offices, factories, homes, , store,garage, supermarket, ,villas, mail box and so on place! MEMORY FUNCTION:Remember your last set melody and volume level after power off,then don't need to reset to your previous settings again. Power Supply (Receiver): Micro-USB or AAA alkaline battery x 3 (not included) Battery lifespan: 5-7 months (based on 30 minutes per day) Operating range: 280m/918ft Working frequency: 433.92MHz Magnetic Transmitter: Low battery indication colour: white Material: ABS size: 70 * 40 * 116mm Package Contents: 1 * host 2 * infrared detector Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.