USB mini wireless doorbell

Small ring doorbell with big energy, sound lound enough of 85dB at one meter's distance. 4 Adjustable volume, 32 optional ringtones. Memory function makes the doorbell remember the last ringtone and volume, no need to reset even if after a power outage. Check more features as below: Easy installation, just insert the mini USB wireless doorbell chime into the USB outlet, and install the kinetic wireless doorbell transmitter with a sticky pad or assemble screws and anchors. The wireless USB doorbell is featured with 2.0 plug, power supply is DC 5V 1A. The operating range of this kinetic wireless doorbell is up to 150 metres on open air, which is applicable for villa, multi-story houses or big property.           The transmitter is waterproof IP44 and no battery required, better suited to bearing up under adverse conditions.                                …