4EN950AAACW: 4.8 volt 950mAh ENELOOP AAA NiMH receiver battery pack.  Arrives to you PRE-CHARGED & READY TO USE !  Made with ENELOOP PRO premium Nickel Hydride batteries.  Choose Connector, and choose pack Shape.  Pricing reflects options chosen.  Flat pack size: 1.75" x 1.75" x 0.45".  Square pack size 1.75" x 0.9" x 0.9".  Weight = approx 2.5 ounces. X-ref part  4BK-4HCCAW.
Cross-reference part # 4BK-4HCCAW