About the product2 chimes vs 2 push buttons【 Wireless Guard 】 2 Receiver 2 Call Button. Allow caregivers and residents to be free for their daily work and life. When the elderly and senior need a help, just press the call button. Ideal for elderly, seniors, patients, disabled. Protect the elderly privacy and independence【 Easy to Carry 】 The caregiver pager system can be used in the bedroom, kitchen or yard with open area 300 FT working range. The call button can take by hand, put into pocket, hung around the neck of the person with a neck strap who needs help like a pendant and secured with a bracket or double sticker【 55 Ringtones & 5 volume level】 The receiver of caregiver pager has 55 ringing tones to choose from and 5 level adjustable volume from 0db to 110db. Easy use by plug the receiver into an electrical outlet and you can set the suitable volume level as your request【 Waterproof and dustproof 】 Both call button and receiver are waterproof and dustproof. Whether you install it in the washroom or take it outside on a rainy day, you don’t have to worry about this caregiver pager getting wet User ReminderThis product has been programmed, tested, and inspected in the USA, therefore; no more programming and setup is needed.Just plug part A (calling bell) into a power outlet and then press Part B (calling Button) when you need someone’s attention.Additionally, we are providing a YouTube link for you to see. https://www.youtube.com/watch?v=Rllc1k8LUq8 The videos will show you how easily the Nursing care calling bell works.We have tied the key strap for you, so you don’t even need to tie the key strap. If you still want to learn how to tie the key strap, please check the following YouTube link for reference.https://www.youtube.com/watch?v=xXsFEf4WTw0 The linked video will show you how to tie the key strap to the Calling Button (Part B).Once again, thank you very much for your business. You have a wonderful day.