1. Voice Change Function With A Man Voice Children And Women Get When Alone 2. Video, Capture, Melody Notifying At Once 3. Easy Installation Paste Or Screw Fixed, Sticker Paste Or Physically Screw Fixed 2Way Installation 4. High Definition Night Vision, Infrared Night Vision Function.Auto Switch Day/Night. 5. 38 Melodies For Your Options, Built-In Melodies, Adjustable Volume Charging Type:Built-In Lithium Battery, Rechargeable Function:Charging Time Is About 2 Hours; One Charge Lasts About 2 Months Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:ABS Package Contents: 1 * X9 Doorbell Host 1 * Charging Cable 1 * Dingdong Machine 1 * English Instruction Manual Only the above package content, other products are not included. Note: Light reflection 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.