- Callen Enterprises Limited
- Telecommunication cable, fiber optic cable, telephone, bone conduction telephone, Plastic Toys, O Card, Telecom Cables, Wall Materials, Telephones & Parts, Electronic Component.
- Address:HK
- M Tech Mfg. Ltd.
- GPS,blue tooth ear phone,bone conduction product,call center unit.
- Address:Rm 605, New East Ocean Ctr. 9 Science Museum Rd. ,
- Castel Telecmmunications Holdings Co., Ltd.
- Bone conduction phone; GPS System; GPS Pocket Size; GPS device; Tactical one Vibration Headset system...,Telephones & Parts.
- Address:Science Park East Ave
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