Aweek Wireless Doorbell Kit Operating at over 600-feet Range with Over 36 Chimes and 4 Volume Levels, Battery Included (1 Transmitter+1 Receiver) Super power-saving mode,Bionic comfortable button,easy remote access,CE, RoHS certification. 36 various melodies for you to choose for the specific receiver chime,with 4 levels volume adjustable for the wireless doorbell kit,special high fidelity music chords, selected from the world classical music. Radio distance reach 400 feet operating rang and 600 feet in open area. more convenient.(Wireless range depends on construction and materials) Includes 1 waterproof push button transmitter,and 1 plugin receiver units with LED indicator,and battery for remote transmitter.Note:We have printed our logo " Aweek" on the product. If you receive the item without our logo, please complain to Amazon directly. Cool blue LED flashes. It also can be best to present as new dasign and nice apprearance, are very popular for household.For the older or pragnants,in any special circumstance,they just press the transmitter,the other peoples in house can receive the SOS signal.