3pcs Wireless Intercom System 433Mhz Secure Interphone Handsets Extendable for Hotel Warehouse Office Home

Wireless intercom system, No telephone wires needed, save your phone bills
Clear Voice and Secure Digital Communication. 433MHz working frequency, anti-interference signal. It needs no installation nor an installer, simply plug and use
Rechargeable battery built inside, works with or without electricity power
Long communication range, distance up to 500M depending on the environment
Can be placed on desk or mounted on any surface, horizontally on wall surface or vertically on any flat surface