Motorola RLN4922, Completely Discreet Earpiec Kit Used with 2 or 3 Wire Surveillance Kits For SP50/ Quantity in Basket: None Code: RLN4922 Price: $306.00 Shipping Weight: 5.00 pounds Suggested List: $340.00 Quantity: Motorola RLN4922, Completely Discreet Earpiece Kit - Must Be Used With Any Standard 2 or 3 Wire Surveillance Kit (HMN9754, RLN4895 & RLN5198AP) For SP50, SP50+, P1225 & P1225LS.