_peripheralManager = [[CBPeripheralManager alloc]
                      initWithDelegate:self
                                 queue:nil];

NSUUID *uuid = [[NSUUID alloc]
                initWithUUIDString:@"12345678-AAAA-BBBB-CCCC-123456789ABC"];

_region = [[CLBeaconRegion alloc]
           initWithProximityUUID:uuid
                            major:1
                            minor:1
                       identifier:@"com.example.beacon"];