Wireless home pager for the elderly,/emergency call/one-click call for help. Can be worn to sleep and sleep with peace of mind,No more flustered looking for buttons. Strong penetration performance, the receiving distance can reach 300 meters in a straight line from the open space, and it is about 20-45 meters in the case of barrier.Note: The actual received signal varies depending on the environment, and the signal is different due to obstacles. 5 levels of volume,the sound size is set as you want, and the mute is adjustable,60 pieces of music to change as you like. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Voltage: AC110V Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on. Color: Black Material: plastic Package Contents: 1 x Wireless Watch Button 1 x Call Receiver 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.