Ⅰ. IP68 waterproof: can extend the service life Ⅱ. Long-distance signal transmission can be heard even in the bedroom Ⅲ. The volume is loud, which solves the problem of inaudibility for the elderly. You can also set one-click mute and do not disturb, which is convenient for the elderly. The volume can be adjusted as you like. Ⅳ. Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, the United States, the Philippines, Taiwan and so on. Ⅴ. Voltage: AC110V Ⅵ. Plug Type: EU Plug, it applies to Indonesia, Germany, France, Spain, Italy and so on Ⅶ. Voltage: AC100-240V Ⅷ. Plug Type: UK plug, it applies to Malaysia, the United Kingdom and so on. Ⅸ. Voltage: AC230V Ⅹ. Material: plastic Ⅺ. colour: White Ⅻ. Package Contents: 1 x receiver 1 x transmitter Only the above package content, other products are not included. ⅩⅢ. 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.