Wireless Doorbell, TeckNet Dual-Power Cordless Door Chime With Detachable Desk Stand, Powered by Battery or USB DC Power Adapter Dual-Power Suppliy Design: Can be powered by Battery or USB DC Power Adapter (Not Includecd) Built-in LED Torch: Featuring a handy built-in LED torch for after-dark emergencies such as finding your keys or just to help find your tent! Operating range of over 500 feet. Remote transmitter button is rated IP33 weatherproof and acceptable for outdoor use. 32 different ring tones. Four levels of adjustable volume from 25db to 110db, Memory function for sound and chime selection Package contents: 1 X TeckNet WA628 Wireless Door Bell transmitter, 1 X Dual Powered Receiver, 1 X Micro USB Charging Cable, 1 X Manual