Motorola HLN9133, VOX Adapter Kit for SP50 &SP50+ Quantity in Basket: None Code: HLN9133 Price: $56.50 Shipping Weight: 3.00 pounds Suggested List: $62.75 Quantity: Motorola HLN9133 Vox Adapter Kit (For Use With Headsets Only) for SP50 & SP50+.