Doorbells ALERT

Note 1: The welcome doorbell is with Chinese Greeting text. Pls check it clear before you buy . if you mind,pls do not buy it . Otherwise we will not bear any loss cause by wrong purchasing . Pls k more→now that. Note 2: pls know that the welcome alarm is not included any battery or power adapter . Only sell welcome alarm . if you want ,pls buy separate . Item specifications: Power supply : DC 9-15V (battery not included) Detection range: 4-8 m Volume: 4 levels adjustable (Can't adjust volume at alarm mode) Induction method : infrared sensor triggered 3 modes: Voice Alarm Music,at "Voice" mode: Human voice,dingdong,nihao,huan ying guang ling;at "Alarm"mode: keeps you aware of