Replacement battery fits 10 Xact Communication compatible models. Specifications: 550mAh, 3.7V, Li-ion. Compatible with: Wristlinx x3x, Wristlinx x2x, Wristlinx x33xif-2, Wristlinx x33xif, Wristlinx x3x-2, xb10 and 4 more compatible models. Replaces: Xact Communication XB10. Xact Communication replacement battery designed for Two-Way Radio devices. Designed for long-lasting power.