[ 5 Mode Choices ] Welcome / Doorbell / Alarm / Color light/ Lighting: 1, Welcome reminder mode ( default ): Ding dong + selected 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 your choice. 3, Alert mode: Daytime & Night anti-theft mode, the detector sensor illegal intrusion, immediately sounded 113 dB treble alarm 30 seconds, wake or alert you if at home and possibly alert neighbors. Functions: Welcome the guest/customer/visitor in day time, anti-thief in the night, prevent the loss of dementia patients,welcome /doorbell /alarm / color light etc five reminder, the secret assistant of the boss! 8 chord music chip, 40mm big horn, more pleasant, more loudly! 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! Independent 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, upscale clubs, hotels, offices, factories, homes, banks, store,garage, supermarket, boutique,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 Ring Volume: 113dB Working frequency: 433.92MHz Magnetic Transmitter: Low battery indication Remote Control Size: 2.36x1.57x0.79inch Colour: white Material: abs Package Contents: 1 * Receiver 2 * Sensor Only the above package content, other products are not included. Note: Light shooting 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.