Ends 9/7 at 10PM PT. Tools.woot! has the Avantek Wireless Door Bell (LD-CB-11-A, Black) for $13 with free shipping with Amazon Prime, otherwise $6. Has 52 chime options, 5 volume levels, and LED flash. Works between -4 °F to 140 °F.

• The white model is $13 on Amazon as well.