| Business | Phone |
| Grace Systems 34 Garvies Point Rd, Glen Cove 11542 | (516) 671-9400 |
| Reliance Alarm Systems 227 Lawrence Ln, Glen Cove 11542 | (516) 671-8690 |
| Safeway Alarm Inc 56 Valentine Ave, Glen Cove 11542 | (516) 676-3188 |
| Satellite Security Systems Inc 70 Forest Ave # E, Glen Cove 11542 | (516) 671-9731 |
| Telstar Security Systems Inc 27 Laurel Ave, Glen Cove 11542 | (516) 676-7700 |